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	diff --git a/lib/common/xml.c b/lib/common/xml.c
	index a88d170086..1191250cb1 100644
	--- a/lib/common/xml.c
	+++ b/lib/common/xml.c
	@@ -1,2651 +1,2645 @@
	/*
	* Copyright 2004-2024 the Pacemaker project contributors
	*
	* The version control history for this file may have further details.
	*
	* This source code is licensed under the GNU Lesser General Public License
	* version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
	*/

	#include <crm_internal.h>

	#include <stdarg.h>
	#include <stdint.h> // uint32_t
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <sys/stat.h> // stat(), S_ISREG, etc.
	#include <sys/types.h>

	#include <glib.h> // gboolean, GString
	#include <libxml/parser.h>
	#include <libxml/tree.h>
	#include <libxml/xmlstring.h> // xmlGetUTF8Char()

	#include <crm/crm.h>
	#include <crm/common/xml.h>
	#include <crm/common/xml_internal.h> // PCMK__XML_LOG_BASE, etc.
	#include "crmcommon_private.h"

	//! libxml2 supports only XML version 1.0, at least as of libxml2-2.12.5
	#define XML_VERSION ((pcmkXmlStr) "1.0")

	/*!
	* \internal
	* \brief Apply a function to each XML node in a tree (pre-order, depth-first)
	*
	* \param[in,out] xml XML tree to traverse
	* \param[in,out] fn Function to call for each node (returns \c true to
	* continue traversing the tree or \c false to stop)
	* \param[in,out] user_data Argument to \p fn
	*
	* \return \c false if any \p fn call returned \c false, or \c true otherwise
	*
	* \note This function is recursive.
	*/
	bool
	pcmk__xml_tree_foreach(xmlNode xml, bool (fn)(xmlNode , void ),
	void *user_data)
	{
	if (!fn(xml, user_data)) {
	return false;
	}

	for (xml = pcmk__xml_first_child(xml); xml != NULL;
	xml = pcmk__xml_next(xml)) {

	if (!pcmk__xml_tree_foreach(xml, fn, user_data)) {
	return false;
	}
	}
	return true;
	}

	bool
	pcmk__tracking_xml_changes(xmlNode *xml, bool lazy)
	{
	if(xml == NULL \|\| xml->doc == NULL \|\| xml->doc->_private == NULL) {
	return FALSE;
	} else if (!pcmk_is_set(((xml_doc_private_t *)xml->doc->_private)->flags,
	pcmk__xf_tracking)) {
	return FALSE;
	} else if (lazy && !pcmk_is_set(((xml_doc_private_t *)xml->doc->_private)->flags,
	pcmk__xf_lazy)) {
	return FALSE;
	}
	return TRUE;
	}

	static inline void
	set_parent_flag(xmlNode *xml, long flag)
	{
	for(; xml; xml = xml->parent) {
	xml_node_private_t *nodepriv = xml->_private;

	if (nodepriv == NULL) {
	/* During calls to xmlDocCopyNode(), _private will be unset for parent nodes */
	} else {
	pcmk__set_xml_flags(nodepriv, flag);
	}
	}
	}

	void
	pcmk__set_xml_doc_flag(xmlNode *xml, enum xml_private_flags flag)
	{
	if(xml && xml->doc && xml->doc->_private){
	/* During calls to xmlDocCopyNode(), xml->doc may be unset */
	xml_doc_private_t *docpriv = xml->doc->_private;

	pcmk__set_xml_flags(docpriv, flag);
	}
	}

	// Mark document, element, and all element's parents as changed
	void
	pcmk__mark_xml_node_dirty(xmlNode *xml)
	{
	pcmk__set_xml_doc_flag(xml, pcmk__xf_dirty);
	set_parent_flag(xml, pcmk__xf_dirty);
	}

	/*!
	* \internal
	* \brief Clear flags on an XML node
	*
	* \param[in,out] xml XML node whose flags to reset
	* \param[in,out] user_data Ignored
	*
	* \return \c true (to continue traversing the tree)
	*
	* \note This is compatible with \c pcmk__xml_tree_foreach().
	*/
	static bool
	reset_xml_node_flags(xmlNode xml, void user_data)
	{
	xml_node_private_t *nodepriv = xml->_private;

	if (nodepriv != NULL) {
	nodepriv->flags = pcmk__xf_none;
	}
	return true;
	}

	/*!
	* \internal
	* \brief Set the \c pcmk__xf_dirty and \c pcmk__xf_created flags on an XML node
	*
	* \param[in,out] xml Node whose flags to set
	* \param[in] user_data Ignored
	*
	* \return \c true (to continue traversing the tree)
	*
	* \note This is compatible with \c pcmk__xml_tree_foreach().
	*/
	static bool
	mark_xml_dirty_created(xmlNode xml, void user_data)
	{
	xml_node_private_t *nodepriv = xml->_private;

	if (nodepriv != NULL) {
	pcmk__set_xml_flags(nodepriv, pcmk__xf_dirty\|pcmk__xf_created);
	}
	return true;
	}

	/*!
	* \internal
	* \brief Mark an XML tree as dirty and created, and mark its parents dirty
	*
	* Also mark the document dirty.
	*
	* \param[in,out] xml Tree to mark as dirty and created
	*/
	void
	pcmk__xml_mark_created(xmlNode *xml)
	{
	CRM_ASSERT(xml != NULL);

	if (!pcmk__tracking_xml_changes(xml, false)) {
	// Tracking is disabled for entire document
	return;
	}

	// Mark all parents and document dirty
	pcmk__mark_xml_node_dirty(xml);

	pcmk__xml_tree_foreach(xml, mark_xml_dirty_created, NULL);
	}

	// Free an XML object previously marked as deleted
	static void
	free_deleted_object(void *data)
	{
	if(data) {
	pcmk__deleted_xml_t *deleted_obj = data;

	g_free(deleted_obj->path);
	free(deleted_obj);
	}
	}

	// Free and NULL user, ACLs, and deleted objects in an XML node's private data
	static void
	reset_xml_private_data(xml_doc_private_t *docpriv)
	{
	if (docpriv != NULL) {
	CRM_ASSERT(docpriv->check == PCMK__XML_DOC_PRIVATE_MAGIC);

	free(docpriv->user);
	docpriv->user = NULL;

	if (docpriv->acls != NULL) {
	pcmk__free_acls(docpriv->acls);
	docpriv->acls = NULL;
	}

	if(docpriv->deleted_objs) {
	g_list_free_full(docpriv->deleted_objs, free_deleted_object);
	docpriv->deleted_objs = NULL;
	}
	}
	}

	// Free all private data associated with an XML node
	static void
	free_private_data(xmlNode *node)
	{
	/* Note:

	This function frees private data assosciated with an XML node,
	unless the function is being called as a result of internal
	XSLT cleanup.

	That could happen through, for example, the following chain of
	function calls:

	xsltApplyStylesheetInternal
	-> xsltFreeTransformContext
	-> xsltFreeRVTs
	-> xmlFreeDoc

	And in that case, the node would fulfill three conditions:

	1. It would be a standalone document (i.e. it wouldn't be
	part of a document)
	2. It would have a space-prefixed name (for reference, please
	see xsltInternals.h: XSLT_MARK_RES_TREE_FRAG)
	3. It would carry its own payload in the _private field.

	We do not free data in this circumstance to avoid a failed
	assertion on the PCMK__XML_*_PRIVATE_MAGIC later.

	*/
	if (node->name == NULL \|\| node->name[0] != ' ') {
	if (node->_private) {
	if (node->type == XML_DOCUMENT_NODE) {
	reset_xml_private_data(node->_private);
	} else {
	CRM_ASSERT(((xml_node_private_t *) node->_private)->check
	== PCMK__XML_NODE_PRIVATE_MAGIC);
	/* nothing dynamically allocated nested */
	}
	free(node->_private);
	node->_private = NULL;
	}
	}
	}

	// Allocate and initialize private data for an XML node
	static void
	new_private_data(xmlNode *node)
	{
	switch (node->type) {
	case XML_DOCUMENT_NODE: {
	xml_doc_private_t *docpriv =
	pcmk__assert_alloc(1, sizeof(xml_doc_private_t));

	docpriv->check = PCMK__XML_DOC_PRIVATE_MAGIC;
	/* Flags will be reset if necessary when tracking is enabled */
	pcmk__set_xml_flags(docpriv, pcmk__xf_dirty\|pcmk__xf_created);
	node->_private = docpriv;
	break;
	}
	case XML_ELEMENT_NODE:
	case XML_ATTRIBUTE_NODE:
	case XML_COMMENT_NODE: {
	xml_node_private_t *nodepriv =
	pcmk__assert_alloc(1, sizeof(xml_node_private_t));

	nodepriv->check = PCMK__XML_NODE_PRIVATE_MAGIC;
	/* Flags will be reset if necessary when tracking is enabled */
	pcmk__set_xml_flags(nodepriv, pcmk__xf_dirty\|pcmk__xf_created);
	node->_private = nodepriv;
	if (pcmk__tracking_xml_changes(node, FALSE)) {
	/* XML_ELEMENT_NODE doesn't get picked up here, node->doc is
	* not hooked up at the point we are called
	*/
	pcmk__mark_xml_node_dirty(node);
	}
	break;
	}
	case XML_TEXT_NODE:
	case XML_DTD_NODE:
	case XML_CDATA_SECTION_NODE:
	break;
	default:
	/* Ignore */
	crm_trace("Ignoring %p %d", node, node->type);
	CRM_LOG_ASSERT(node->type == XML_ELEMENT_NODE);
	break;
	}
	}

	void
	xml_track_changes(xmlNode * xml, const char user, xmlNode acl_source, bool enforce_acls)
	{
	xml_accept_changes(xml);
	crm_trace("Tracking changes%s to %p", enforce_acls?" with ACLs":"", xml);
	pcmk__set_xml_doc_flag(xml, pcmk__xf_tracking);
	if(enforce_acls) {
	if(acl_source == NULL) {
	acl_source = xml;
	}
	pcmk__set_xml_doc_flag(xml, pcmk__xf_acl_enabled);
	pcmk__unpack_acl(acl_source, xml, user);
	pcmk__apply_acl(xml);
	}
	}

	bool xml_tracking_changes(xmlNode * xml)
	{
	return (xml != NULL) && (xml->doc != NULL) && (xml->doc->_private != NULL)
	&& pcmk_is_set(((xml_doc_private_t *)(xml->doc->_private))->flags,
	pcmk__xf_tracking);
	}

	bool xml_document_dirty(xmlNode *xml)
	{
	return (xml != NULL) && (xml->doc != NULL) && (xml->doc->_private != NULL)
	&& pcmk_is_set(((xml_doc_private_t *)(xml->doc->_private))->flags,
	pcmk__xf_dirty);
	}

	/*!
	* \internal
	* \brief Return ordinal position of an XML node among its siblings
	*
	* \param[in] xml XML node to check
	* \param[in] ignore_if_set Don't count siblings with this flag set
	*
	* \return Ordinal position of \p xml (starting with 0)
	*/
	int
	pcmk__xml_position(const xmlNode *xml, enum xml_private_flags ignore_if_set)
	{
	int position = 0;

	for (const xmlNode *cIter = xml; cIter->prev; cIter = cIter->prev) {
	xml_node_private_t nodepriv = ((xmlNode)cIter->prev)->_private;

	if (!pcmk_is_set(nodepriv->flags, ignore_if_set)) {
	position++;
	}
	}

	return position;
	}

	/*!
	* \internal
	* \brief Remove all attributes marked as deleted from an XML node
	*
	* \param[in,out] xml XML node whose deleted attributes to remove
	* \param[in,out] user_data Ignored
	*
	* \return \c true (to continue traversing the tree)
	*
	* \note This is compatible with \c pcmk__xml_tree_foreach().
	*/
	static bool
	accept_attr_deletions(xmlNode xml, void user_data)
	{
	reset_xml_node_flags(xml, NULL);
	pcmk__xe_remove_matching_attrs(xml, pcmk__marked_as_deleted, NULL);
	return true;
	}

	/*!
	* \internal
	* \brief Find first child XML node matching another given XML node
	*
	* \param[in] haystack XML whose children should be checked
	* \param[in] needle XML to match (comment content or element name and ID)
	* \param[in] exact If true and needle is a comment, position must match
	*/
	xmlNode *
	pcmk__xml_match(const xmlNode haystack, const xmlNode needle, bool exact)
	{
	CRM_CHECK(needle != NULL, return NULL);

	if (needle->type == XML_COMMENT_NODE) {
	return pcmk__xc_match(haystack, needle, exact);

	} else {
	const char *id = pcmk__xe_id(needle);
	const char *attr = (id == NULL)? NULL : PCMK_XA_ID;

	return pcmk__xe_first_child(haystack, (const char *) needle->name, attr,
	id);
	}
	}

	void
	xml_accept_changes(xmlNode * xml)
	{
	xmlNode *top = NULL;
	xml_doc_private_t *docpriv = NULL;

	if(xml == NULL) {
	return;
	}

	crm_trace("Accepting changes to %p", xml);
	docpriv = xml->doc->_private;
	top = xmlDocGetRootElement(xml->doc);

	reset_xml_private_data(xml->doc->_private);

	if (!pcmk_is_set(docpriv->flags, pcmk__xf_dirty)) {
	docpriv->flags = pcmk__xf_none;
	return;
	}

	docpriv->flags = pcmk__xf_none;
	pcmk__xml_tree_foreach(top, accept_attr_deletions, NULL);
	}

	/*!
	* \internal
	* \brief Find first XML child element matching given criteria
	*
	* \param[in] parent XML element to search (can be \c NULL)
	* \param[in] node_name If not \c NULL, only match children of this type
	* \param[in] attr_n If not \c NULL, only match children with an attribute
	* of this name.
	* \param[in] attr_v If \p attr_n and this are not NULL, only match children
	* with an attribute named \p attr_n and this value
	*
	* \return Matching XML child element, or \c NULL if none found
	*/
	xmlNode *
	pcmk__xe_first_child(const xmlNode parent, const char node_name,
	const char attr_n, const char attr_v)
	{
	xmlNode *child = NULL;
	const char *parent_name = "<null>";

	CRM_CHECK((attr_v == NULL) \|\| (attr_n != NULL), return NULL);

	if (parent != NULL) {
	child = parent->children;
	while ((child != NULL) && (child->type != XML_ELEMENT_NODE)) {
	child = child->next;
	}

	parent_name = (const char *) parent->name;
	}

	for (; child != NULL; child = pcmk__xe_next(child)) {
	const char *value = NULL;

	if ((node_name != NULL) && !pcmk__xe_is(child, node_name)) {
	// Node name mismatch
	continue;
	}
	if (attr_n == NULL) {
	// No attribute match needed
	return child;
	}

	value = crm_element_value(child, attr_n);

	if ((attr_v == NULL) && (value != NULL)) {
	// attr_v == NULL: Attribute attr_n must be set (to any value)
	return child;
	}
	if ((attr_v != NULL) && (pcmk__str_eq(value, attr_v, pcmk__str_none))) {
	// attr_v != NULL: Attribute attr_n must be set to value attr_v
	return child;
	}
	}

	if (node_name == NULL) {
	node_name = "(any)"; // For logging
	}
	if (attr_n != NULL) {
	crm_trace("XML child node <%s %s=%s> not found in %s",
	node_name, attr_n, attr_v, parent_name);
	} else {
	crm_trace("XML child node <%s> not found in %s",
	node_name, parent_name);
	}
	return NULL;
	}

	/*!
	* \internal
	* \brief Set an XML attribute, expanding \c ++ and \c += where appropriate
	*
	* If \p target already has an attribute named \p name set to an integer value
	* and \p value is an addition assignment expression on \p name, then expand
	* \p value to an integer and set attribute \p name to the expanded value in
	* \p target.
	*
	* Otherwise, set attribute \p name on \p target using the literal \p value.
	*
	* The original attribute value in \p target and the number in an assignment
	* expression in \p value are parsed and added as scores (that is, their values
	* are capped at \c INFINITY and \c -INFINITY). For more details, refer to
	* \c char2score().
	*
	* For example, suppose \p target has an attribute named \c "X" with value
	* \c "5", and that \p name is \c "X".
	* * If \p value is \c "X++", the new value of \c "X" in \p target is \c "6".
	* * If \p value is \c "X+=3", the new value of \c "X" in \p target is \c "8".
	* * If \p value is \c "val", the new value of \c "X" in \p target is \c "val".
	* * If \p value is \c "Y++", the new value of \c "X" in \p target is \c "Y++".
	*
	* \param[in,out] target XML node whose attribute to set
	* \param[in] name Name of the attribute to set
	* \param[in] value New value of attribute to set
	*
	* \return Standard Pacemaker return code (specifically, \c EINVAL on invalid
	* argument, or \c pcmk_rc_ok otherwise)
	*/
	int
	pcmk__xe_set_score(xmlNode target, const char name, const char *value)
	{
	const char *old_value = NULL;

	CRM_CHECK((target != NULL) && (name != NULL), return EINVAL);

	if (value == NULL) {
	return pcmk_rc_ok;
	}

	old_value = crm_element_value(target, name);

	// If no previous value, skip to default case and set the value unexpanded.
	if (old_value != NULL) {
	const char *n = name;
	const char *v = value;

	// Stop at first character that differs between name and value
	for (; (n == v) && (*n != '\0'); n++, v++);

	// If value begins with name followed by a "++" or "+="
	if ((*n == '\0')
	&& (*v++ == '+')
	&& ((v == '+') \|\| (v == '='))) {

	// If we're expanding ourselves, no previous value was set; use 0
	int old_value_i = (old_value != value)? char2score(old_value) : 0;

	/* value="X++": new value of X is old_value + 1
	* value="X+=Y": new value of X is old_value + Y (for some number Y)
	*/
	int add = (*v == '+')? 1 : char2score(++v);

	crm_xml_add_int(target, name, pcmk__add_scores(old_value_i, add));
	return pcmk_rc_ok;
	}
	}

	// Default case: set the attribute unexpanded (with value treated literally)
	if (old_value != value) {
	crm_xml_add(target, name, value);
	}
	return pcmk_rc_ok;
	}

	/*!
	* \internal
	* \brief Copy XML attributes from a source element to a target element
	*
	* This is similar to \c xmlCopyPropList() except that attributes are marked
	* as dirty for change tracking purposes.
	*
	* \param[in,out] target XML element to receive copied attributes from \p src
	* \param[in] src XML element whose attributes to copy to \p target
	* \param[in] flags Group of <tt>enum pcmk__xa_flags</tt>
	*
	* \return Standard Pacemaker return code
	*/
	int
	pcmk__xe_copy_attrs(xmlNode target, const xmlNode src, uint32_t flags)
	{
	CRM_CHECK((src != NULL) && (target != NULL), return EINVAL);

	for (xmlAttr *attr = pcmk__xe_first_attr(src); attr != NULL;
	attr = attr->next) {

	const char name = (const char ) attr->name;
	const char *value = pcmk__xml_attr_value(attr);

	if (pcmk_is_set(flags, pcmk__xaf_no_overwrite)
	&& (crm_element_value(target, name) != NULL)) {
	continue;
	}

	if (pcmk_is_set(flags, pcmk__xaf_score_update)) {
	pcmk__xe_set_score(target, name, value);
	} else {
	crm_xml_add(target, name, value);
	}
	}

	return pcmk_rc_ok;
	}

	/*!
	* \internal
	- * \brief Move an XML attribute to the end of its element's attribute list
	+ * \brief Compare two XML attributes by name
	*
	- * This does not consider ACLs and does not mark the attribute as deleted or
	- * dirty. Upon return, the attribute still exists and is set to the same value
	- * as before the call. Only its position in the attribute list may change.
	+ * \param[in] a First XML attribute to compare
	+ * \param[in] b Second XML attribute to compare
	*
	- * \param[in] data \c pcmk_nvpair_t representing an XML attribute
	- * \param[in,out] user_data XML element whose attribute to move
	+ * \retval negative \c a->name is \c NULL or comes before \c b->name
	+ * lexicographically
	+ * \retval 0 \c a->name and \c b->name are equal
	+ * \retval positive \c b->name is \c NULL or comes before \c a->name
	+ * lexicographically
	*/
	-static void
	-move_xml_attr_to_end(gpointer data, gpointer user_data)
	+static gint
	+compare_xml_attr(gconstpointer a, gconstpointer b)
	{
	- const pcmk_nvpair_t *pair = data;
	- xmlNode *xml = user_data;
	-
	- xmlAttr *attr = xmlHasProp(xml, (pcmkXmlStr) pair->name);
	- xml_node_private_t *nodepriv = attr->_private;
	- uint32_t flags = (nodepriv != NULL)? nodepriv->flags : pcmk__xf_none;
	-
	- xmlRemoveProp(attr);
	- attr = xmlSetProp(xml, (pcmkXmlStr) pair->name, (pcmkXmlStr) pair->value);
	+ const xmlAttr *attr_a = a;
	+ const xmlAttr *attr_b = b;

	- nodepriv = attr->_private;
	- if (nodepriv != NULL) {
	- nodepriv->flags = flags;
	- }
	+ return pcmk__strcmp((const char *) attr_a->name,
	+ (const char *) attr_b->name, pcmk__str_none);
	}

	/*!
	* \internal
	* \brief Sort an XML element's attributes by name
	*
	* This does not consider ACLs and does not mark the attributes as deleted or
	* dirty. Upon return, all attributes still exist and are set to the same values
	* as before the call. The only thing that may change is the order of the
	* attribute list.
	*
	* \param[in,out] xml XML element whose attributes to sort
	*/
	void
	pcmk__xe_sort_attrs(xmlNode *xml)
	{
	- xmlAttr *attr = pcmk__xe_first_attr(xml);
	- GSList *nvpairs = NULL;
	+ GSList *attr_list = NULL;

	- if ((attr == NULL) \|\| (attr->next == NULL)) {
	- return;
	+ for (xmlAttr *iter = pcmk__xe_first_attr(xml); iter != NULL;
	+ iter = iter->next) {
	+ attr_list = g_slist_prepend(attr_list, iter);
	}
	+ attr_list = g_slist_sort(attr_list, compare_xml_attr);

	- nvpairs = pcmk_xml_attrs2nvpairs(xml);
	- nvpairs = pcmk_sort_nvpairs(nvpairs);
	-
	- // Reset attributes in sorted order
	- g_slist_foreach(nvpairs, move_xml_attr_to_end, xml);
	+ for (GSList *iter = attr_list; iter != NULL; iter = iter->next) {
	+ xmlNode *attr = iter->data;

	- pcmk_free_nvpairs(nvpairs);
	+ xmlUnlinkNode(attr);
	+ xmlAddChild(xml, attr);
	+ }
	+ g_slist_free(attr_list);
	}

	/*!
	* \internal
	* \brief Remove an XML attribute from an element
	*
	* \param[in,out] element XML element that owns \p attr
	* \param[in,out] attr XML attribute to remove from \p element
	*
	* \return Standard Pacemaker return code (\c EPERM if ACLs prevent removal of
	* attributes from \p element, or \c pcmk_rc_ok otherwise)
	*/
	static int
	remove_xe_attr(xmlNode element, xmlAttr attr)
	{
	if (attr == NULL) {
	return pcmk_rc_ok;
	}

	if (!pcmk__check_acl(element, NULL, pcmk__xf_acl_write)) {
	// ACLs apply to element, not to particular attributes
	crm_trace("ACLs prevent removal of attributes from %s element",
	(const char *) element->name);
	return EPERM;
	}

	if (pcmk__tracking_xml_changes(element, false)) {
	// Leave in place (marked for removal) until after diff is calculated
	set_parent_flag(element, pcmk__xf_dirty);
	pcmk__set_xml_flags((xml_node_private_t *) attr->_private,
	pcmk__xf_deleted);
	} else {
	xmlRemoveProp(attr);
	}
	return pcmk_rc_ok;
	}

	/*!
	* \internal
	* \brief Remove a named attribute from an XML element
	*
	* \param[in,out] element XML element to remove an attribute from
	* \param[in] name Name of attribute to remove
	*/
	void
	pcmk__xe_remove_attr(xmlNode element, const char name)
	{
	if (name != NULL) {
	remove_xe_attr(element, xmlHasProp(element, (pcmkXmlStr) name));
	}
	}

	/*!
	* \internal
	* \brief Remove a named attribute from an XML element
	*
	* This is a wrapper for \c pcmk__xe_remove_attr() for use with
	* \c pcmk__xml_tree_foreach().
	*
	* \param[in,out] xml XML element to remove an attribute from
	* \param[in] user_data Name of attribute to remove
	*
	* \return \c true (to continue traversing the tree)
	*
	* \note This is compatible with \c pcmk__xml_tree_foreach().
	*/
	bool
	pcmk__xe_remove_attr_cb(xmlNode xml, void user_data)
	{
	const char *name = user_data;

	pcmk__xe_remove_attr(xml, name);
	return true;
	}

	/*!
	* \internal
	* \brief Remove an XML element's attributes that match some criteria
	*
	* \param[in,out] element XML element to modify
	* \param[in] match If not NULL, only remove attributes for which
	* this function returns true
	* \param[in,out] user_data Data to pass to \p match
	*/
	void
	pcmk__xe_remove_matching_attrs(xmlNode *element,
	bool (match)(xmlAttrPtr, void ),
	void *user_data)
	{
	xmlAttrPtr next = NULL;

	for (xmlAttrPtr a = pcmk__xe_first_attr(element); a != NULL; a = next) {
	next = a->next; // Grab now because attribute might get removed
	if ((match == NULL) \|\| match(a, user_data)) {
	if (remove_xe_attr(element, a) != pcmk_rc_ok) {
	return;
	}
	}
	}
	}

	/*!
	* \internal
	* \brief Create a new XML element under a given parent
	*
	* \param[in,out] parent XML element that will be the new element's parent
	* (\c NULL to create a new XML document with the new
	* node as root)
	* \param[in] name Name of new element
	*
	* \return Newly created XML element (guaranteed not to be \c NULL)
	*/
	xmlNode *
	pcmk__xe_create(xmlNode parent, const char name)
	{
	xmlNode *node = NULL;

	CRM_ASSERT(!pcmk__str_empty(name));

	if (parent == NULL) {
	xmlDoc *doc = pcmk__xml_new_doc();

	node = xmlNewDocRawNode(doc, NULL, (pcmkXmlStr) name, NULL);
	pcmk__mem_assert(node);

	xmlDocSetRootElement(doc, node);

	} else {
	node = xmlNewChild(parent, NULL, (pcmkXmlStr) name, NULL);
	pcmk__mem_assert(node);
	}

	pcmk__xml_mark_created(node);
	return node;
	}

	/*!
	* \internal
	* \brief Create a new XML document
	*
	* \return Newly allocated XML document (guaranteed not to be \c NULL)
	*
	* \note The caller is responsible for freeing the return value using
	* \c pcmk__xml_free_doc().
	*/
	xmlDoc *
	pcmk__xml_new_doc(void)
	{
	/* @TODO Allocate document private data here when we drop
	* new_private_data()/free_private_data()
	*/
	xmlDoc *doc = xmlNewDoc(XML_VERSION);

	pcmk__mem_assert(doc);
	return doc;
	}

	/*!
	* \internal
	* \brief Free a new XML document
	*
	* \param[in,out] doc XML document to free
	*/
	void
	pcmk__xml_free_doc(xmlDoc *doc)
	{
	/* @TODO Free document private data here when we drop
	* new_private_data()/free_private_data()
	*/
	if (doc != NULL) {
	xmlFreeDoc(doc);
	}
	}

	/*!
	* \internal
	* \brief Set a formatted string as an XML node's content
	*
	* \param[in,out] node Node whose content to set
	* \param[in] format <tt>printf(3)</tt>-style format string
	* \param[in] ... Arguments for \p format
	*
	* \note This function escapes special characters. \c xmlNodeSetContent() does
	* not.
	*/
	G_GNUC_PRINTF(2, 3)
	void
	pcmk__xe_set_content(xmlNode node, const char format, ...)
	{
	if (node != NULL) {
	const char *content = NULL;
	char *buf = NULL;

	if (strchr(format, '%') == NULL) {
	// Nothing to format
	content = format;

	} else {
	va_list ap;

	va_start(ap, format);

	if (pcmk__str_eq(format, "%s", pcmk__str_none)) {
	// No need to make a copy
	content = va_arg(ap, const char *);

	} else {
	CRM_ASSERT(vasprintf(&buf, format, ap) >= 0);
	content = buf;
	}
	va_end(ap);
	}

	xmlNodeSetContent(node, (pcmkXmlStr) content);
	free(buf);
	}
	}

	/*!
	* \internal
	* \brief Check whether the first character of a string is an XML NameStartChar
	*
	* See https://www.w3.org/TR/xml/#NT-NameStartChar.
	*
	* This is almost identical to libxml2's \c xmlIsDocNameStartChar(), but they
	* don't expose it as part of the public API.
	*
	* \param[in] utf8 UTF-8 encoded string
	* \param[out] len If not \c NULL, where to store size in bytes of first
	* character in \p utf8
	*
	* \return \c true if \p utf8 begins with a valid XML NameStartChar, or \c false
	* otherwise
	*/
	bool
	pcmk__xml_is_name_start_char(const char utf8, int len)
	{
	int c = 0;
	int local_len = 0;

	if (len == NULL) {
	len = &local_len;
	}

	/* xmlGetUTF8Char() abuses the len argument. At call time, it must be set to
	* "the minimum number of bytes present in the sequence... to assure the
	* next character is completely contained within the sequence." It's similar
	* to the "n" in the strn*() functions. However, this doesn't make any sense
	* for null-terminated strings, and there's no value that indicates "keep
	* going until '\0'." So we set it to 4, the max number of bytes in a UTF-8
	* character.
	*
	* At return, it's set to the actual number of bytes in the char, or 0 on
	* error.
	*/
	*len = 4;

	// Note: xmlGetUTF8Char() assumes a 32-bit int
	c = xmlGetUTF8Char((pcmkXmlStr) utf8, len);
	if (c < 0) {
	GString *buf = g_string_sized_new(32);

	for (int i = 0; (i < 4) && (utf8[i] != '\0'); i++) {
	g_string_append_printf(buf, " 0x%.2X", utf8[i]);
	}
	crm_info("Invalid UTF-8 character (bytes:%s)",
	(pcmk__str_empty(buf->str)? " <none>" : buf->str));
	g_string_free(buf, TRUE);
	return false;
	}

	return (c == '_')
	\|\| (c == ':')
	\|\| ((c >= 'a') && (c <= 'z'))
	\|\| ((c >= 'A') && (c <= 'Z'))
	\|\| ((c >= 0xC0) && (c <= 0xD6))
	\|\| ((c >= 0xD8) && (c <= 0xF6))
	\|\| ((c >= 0xF8) && (c <= 0x2FF))
	\|\| ((c >= 0x370) && (c <= 0x37D))
	\|\| ((c >= 0x37F) && (c <= 0x1FFF))
	\|\| ((c >= 0x200C) && (c <= 0x200D))
	\|\| ((c >= 0x2070) && (c <= 0x218F))
	\|\| ((c >= 0x2C00) && (c <= 0x2FEF))
	\|\| ((c >= 0x3001) && (c <= 0xD7FF))
	\|\| ((c >= 0xF900) && (c <= 0xFDCF))
	\|\| ((c >= 0xFDF0) && (c <= 0xFFFD))
	\|\| ((c >= 0x10000) && (c <= 0xEFFFF));
	}

	/*!
	* \internal
	* \brief Check whether the first character of a string is an XML NameChar
	*
	* See https://www.w3.org/TR/xml/#NT-NameChar.
	*
	* This is almost identical to libxml2's \c xmlIsDocNameChar(), but they don't
	* expose it as part of the public API.
	*
	* \param[in] utf8 UTF-8 encoded string
	* \param[out] len If not \c NULL, where to store size in bytes of first
	* character in \p utf8
	*
	* \return \c true if \p utf8 begins with a valid XML NameChar, or \c false
	* otherwise
	*/
	bool
	pcmk__xml_is_name_char(const char utf8, int len)
	{
	int c = 0;
	int local_len = 0;

	if (len == NULL) {
	len = &local_len;
	}

	// See comment regarding len in pcmk__xml_is_name_start_char()
	*len = 4;

	// Note: xmlGetUTF8Char() assumes a 32-bit int
	c = xmlGetUTF8Char((pcmkXmlStr) utf8, len);
	if (c < 0) {
	GString *buf = g_string_sized_new(32);

	for (int i = 0; (i < 4) && (utf8[i] != '\0'); i++) {
	g_string_append_printf(buf, " 0x%.2X", utf8[i]);
	}
	crm_info("Invalid UTF-8 character (bytes:%s)",
	(pcmk__str_empty(buf->str)? " <none>" : buf->str));
	g_string_free(buf, TRUE);
	return false;
	}

	return ((c >= 'a') && (c <= 'z'))
	\|\| ((c >= 'A') && (c <= 'Z'))
	\|\| ((c >= '0') && (c <= '9'))
	\|\| (c == '_')
	\|\| (c == ':')
	\|\| (c == '-')
	\|\| (c == '.')
	\|\| (c == 0xB7)
	\|\| ((c >= 0xC0) && (c <= 0xD6))
	\|\| ((c >= 0xD8) && (c <= 0xF6))
	\|\| ((c >= 0xF8) && (c <= 0x2FF))
	\|\| ((c >= 0x300) && (c <= 0x36F))
	\|\| ((c >= 0x370) && (c <= 0x37D))
	\|\| ((c >= 0x37F) && (c <= 0x1FFF))
	\|\| ((c >= 0x200C) && (c <= 0x200D))
	\|\| ((c >= 0x203F) && (c <= 0x2040))
	\|\| ((c >= 0x2070) && (c <= 0x218F))
	\|\| ((c >= 0x2C00) && (c <= 0x2FEF))
	\|\| ((c >= 0x3001) && (c <= 0xD7FF))
	\|\| ((c >= 0xF900) && (c <= 0xFDCF))
	\|\| ((c >= 0xFDF0) && (c <= 0xFFFD))
	\|\| ((c >= 0x10000) && (c <= 0xEFFFF));
	}

	/*!
	* \internal
	* \brief Sanitize a string so it is usable as an XML ID
	*
	* An ID must match the Name production as defined here:
	* https://www.w3.org/TR/xml/#NT-Name.
	*
	* Convert an invalid start character to \c '_'. Convert an invalid character
	* after the start character to \c '.'.
	*
	* \param[in,out] id String to sanitize
	*/
	void
	pcmk__xml_sanitize_id(char *id)
	{
	bool valid = true;
	int len = 0;

	// If id is empty or NULL, there's no way to make it a valid XML ID
	CRM_ASSERT(!pcmk__str_empty(id));

	/* @TODO Suppose there are two strings and each has an invalid ID character
	* in the same position. The strings are otherwise identical. Both strings
	* will be sanitized to the same valid ID, which is incorrect.
	*
	* The caller is responsible for ensuring the sanitized ID does not already
	* exist in a given XML document before using it, if uniqueness is desired.
	*/
	valid = pcmk__xml_is_name_start_char(id, &len);
	CRM_CHECK(len > 0, return); // UTF-8 encoding error
	if (!valid) {
	*id = '_';
	for (int i = 1; i < len; i++) {
	id[i] = '.';
	}
	}

	for (id += len; *id != '\0'; id += len) {
	valid = pcmk__xml_is_name_char(id, &len);
	CRM_CHECK(len > 0, return); // UTF-8 encoding error
	if (!valid) {
	for (int i = 0; i < len; i++) {
	id[i] = '.';
	}
	}
	}
	}

	/*!
	* \internal
	* \brief Set a formatted string as an XML element's ID
	*
	* If the formatted string would not be a valid ID, it's first sanitized by
	* \c pcmk__xml_sanitize_id().
	*
	* \param[in,out] node Node whose ID to set
	* \param[in] format <tt>printf(3)</tt>-style format string
	* \param[in] ... Arguments for \p format
	*/
	G_GNUC_PRINTF(2, 3)
	void
	pcmk__xe_set_id(xmlNode node, const char format, ...)
	{
	char *id = NULL;
	va_list ap;

	CRM_ASSERT(!pcmk__str_empty(format));

	if (node == NULL) {
	return;
	}

	va_start(ap, format);
	CRM_ASSERT(vasprintf(&id, format, ap) >= 0);
	va_end(ap);

	if (!xmlValidateNameValue((pcmkXmlStr) id)) {
	pcmk__xml_sanitize_id(id);
	}
	crm_xml_add(node, PCMK_XA_ID, id);
	free(id);
	}

	/*!
	* \internal
	* \brief Free an XML tree without ACL checks or change tracking
	*
	* \param[in,out] xml XML node to free
	*/
	static void
	free_xml_node(xmlNode *xml)
	{
	/* @TODO Free tree private data here when we drop
	* new_private_data()/free_private_data()
	*/
	xmlUnlinkNode(xml);
	xmlFreeNode(xml);
	}

	/*!
	* \internal
	* \brief Free an XML tree if ACLs allow; track deletion if tracking is enabled
	*
	* If \p node is the root of its document, free the entire document.
	*
	* \param[in,out] node XML node to free
	* \param[in] position Position of \p node among its siblings for change
	* tracking (negative to calculate automatically if
	* needed)
	*/
	static void
	free_xml_with_position(xmlNode *node, int position)
	{
	xmlDoc *doc = NULL;
	xml_node_private_t *nodepriv = NULL;

	if (node == NULL) {
	return;
	}
	doc = node->doc;
	nodepriv = node->_private;

	if ((doc != NULL) && (xmlDocGetRootElement(doc) == node)) {
	/* @TODO Should we check ACLs first? Otherwise it seems like we could
	* free the root element without write permission.
	*/
	pcmk__xml_free_doc(doc);
	return;
	}

	if (!pcmk__check_acl(node, NULL, pcmk__xf_acl_write)) {
	GString *xpath = NULL;

	pcmk__if_tracing({}, return);
	xpath = pcmk__element_xpath(node);
	qb_log_from_external_source(__func__, __FILE__,
	"Cannot remove %s %x", LOG_TRACE,
	__LINE__, 0, xpath->str, nodepriv->flags);
	g_string_free(xpath, TRUE);
	return;
	}

	if ((doc != NULL) && pcmk__tracking_xml_changes(node, false)
	&& !pcmk_is_set(nodepriv->flags, pcmk__xf_created)) {

	xml_doc_private_t *docpriv = doc->_private;
	GString *xpath = pcmk__element_xpath(node);

	if (xpath != NULL) {
	pcmk__deleted_xml_t *deleted_obj = NULL;

	crm_trace("Deleting %s %p from %p", xpath->str, node, doc);

	deleted_obj = pcmk__assert_alloc(1, sizeof(pcmk__deleted_xml_t));
	deleted_obj->path = g_string_free(xpath, FALSE);
	deleted_obj->position = -1;

	// Record the position only for XML comments for now
	if (node->type == XML_COMMENT_NODE) {
	if (position >= 0) {
	deleted_obj->position = position;

	} else {
	deleted_obj->position = pcmk__xml_position(node,
	pcmk__xf_skip);
	}
	}

	docpriv->deleted_objs = g_list_append(docpriv->deleted_objs,
	deleted_obj);
	pcmk__set_xml_doc_flag(node, pcmk__xf_dirty);
	}
	}
	free_xml_node(node);
	}

	/*!
	* \internal
	* \brief Free an XML tree if ACLs allow; track deletion if tracking is enabled
	*
	* If \p xml is the root of its document, free the entire document.
	*
	* \param[in,out] xml XML node to free
	*/
	void
	pcmk__xml_free(xmlNode *xml)
	{
	free_xml_with_position(xml, -1);
	}

	/*!
	* \internal
	* \brief Make a deep copy of an XML node under a given parent
	*
	* \param[in,out] parent XML element that will be the copy's parent (\c NULL
	* to create a new XML document with the copy as root)
	* \param[in] src XML node to copy
	*
	* \return Deep copy of \p src, or \c NULL if \p src is \c NULL
	*/
	xmlNode *
	pcmk__xml_copy(xmlNode parent, xmlNode src)
	{
	xmlNode *copy = NULL;

	if (src == NULL) {
	return NULL;
	}

	if (parent == NULL) {
	xmlDoc *doc = NULL;

	// The copy will be the root element of a new document
	CRM_ASSERT(src->type == XML_ELEMENT_NODE);

	doc = pcmk__xml_new_doc();
	copy = xmlDocCopyNode(src, doc, 1);
	pcmk__mem_assert(copy);

	xmlDocSetRootElement(doc, copy);

	} else {
	copy = xmlDocCopyNode(src, parent->doc, 1);
	pcmk__mem_assert(copy);

	xmlAddChild(parent, copy);
	}

	pcmk__xml_mark_created(copy);
	return copy;
	}

	/*!
	* \internal
	* \brief Remove XML text nodes from specified XML and all its children
	*
	* \param[in,out] xml XML to strip text from
	*/
	void
	pcmk__strip_xml_text(xmlNode *xml)
	{
	xmlNode *iter = xml->children;

	while (iter) {
	xmlNode *next = iter->next;

	switch (iter->type) {
	case XML_TEXT_NODE:
	free_xml_node(iter);
	break;

	case XML_ELEMENT_NODE:
	/* Search it */
	pcmk__strip_xml_text(iter);
	break;

	default:
	/* Leave it */
	break;
	}

	iter = next;
	}
	}

	/*!
	* \internal
	* \brief Add a "last written" attribute to an XML element, set to current time
	*
	* \param[in,out] xe XML element to add attribute to
	*
	* \return Value that was set, or NULL on error
	*/
	const char *
	pcmk__xe_add_last_written(xmlNode *xe)
	{
	char *now_s = pcmk__epoch2str(NULL, 0);
	const char *result = NULL;

	result = crm_xml_add(xe, PCMK_XA_CIB_LAST_WRITTEN,
	pcmk__s(now_s, "Could not determine current time"));
	free(now_s);
	return result;
	}

	/*!
	* \internal
	* \brief Check whether a string has XML special characters that must be escaped
	*
	* See \c pcmk__xml_escape() and \c pcmk__xml_escape_type for more details.
	*
	* \param[in] text String to check
	* \param[in] type Type of escaping
	*
	* \return \c true if \p text has special characters that need to be escaped, or
	* \c false otherwise
	*/
	bool
	pcmk__xml_needs_escape(const char *text, enum pcmk__xml_escape_type type)
	{
	if (text == NULL) {
	return false;
	}

	while (*text != '\0') {
	switch (type) {
	case pcmk__xml_escape_text:
	switch (*text) {
	case '<':
	case '>':
	case '&':
	return true;
	case '\n':
	case '\t':
	break;
	default:
	if (g_ascii_iscntrl(*text)) {
	return true;
	}
	break;
	}
	break;

	case pcmk__xml_escape_attr:
	switch (*text) {
	case '<':
	case '>':
	case '&':
	case '"':
	return true;
	default:
	if (g_ascii_iscntrl(*text)) {
	return true;
	}
	break;
	}
	break;

	case pcmk__xml_escape_attr_pretty:
	switch (*text) {
	case '\n':
	case '\r':
	case '\t':
	case '"':
	return true;
	default:
	break;
	}
	break;

	default: // Invalid enum value
	CRM_ASSERT(false);
	break;
	}

	text = g_utf8_next_char(text);
	}
	return false;
	}

	/*!
	* \internal
	* \brief Replace special characters with their XML escape sequences
	*
	* \param[in] text Text to escape
	* \param[in] type Type of escaping
	*
	* \return Newly allocated string equivalent to \p text but with special
	* characters replaced with XML escape sequences (or \c NULL if \p text
	* is \c NULL). If \p text is not \c NULL, the return value is
	* guaranteed not to be \c NULL.
	*
	* \note There are libxml functions that purport to do this:
	* \c xmlEncodeEntitiesReentrant() and \c xmlEncodeSpecialChars().
	* However, their escaping is incomplete. See:
	* https://discourse.gnome.org/t/intended-use-of-xmlencodeentitiesreentrant-vs-xmlencodespecialchars/19252
	* \note The caller is responsible for freeing the return value using
	* \c g_free().
	*/
	gchar *
	pcmk__xml_escape(const char *text, enum pcmk__xml_escape_type type)
	{
	GString *copy = NULL;

	if (text == NULL) {
	return NULL;
	}
	copy = g_string_sized_new(strlen(text));

	while (*text != '\0') {
	// Don't escape any non-ASCII characters
	if ((*text & 0x80) != 0) {
	size_t bytes = g_utf8_next_char(text) - text;

	g_string_append_len(copy, text, bytes);
	text += bytes;
	continue;
	}

	switch (type) {
	case pcmk__xml_escape_text:
	switch (*text) {
	case '<':
	g_string_append(copy, PCMK__XML_ENTITY_LT);
	break;
	case '>':
	g_string_append(copy, PCMK__XML_ENTITY_GT);
	break;
	case '&':
	g_string_append(copy, PCMK__XML_ENTITY_AMP);
	break;
	case '\n':
	case '\t':
	g_string_append_c(copy, *text);
	break;
	default:
	if (g_ascii_iscntrl(*text)) {
	g_string_append_printf(copy, "&#x%.2X;", *text);
	} else {
	g_string_append_c(copy, *text);
	}
	break;
	}
	break;

	case pcmk__xml_escape_attr:
	switch (*text) {
	case '<':
	g_string_append(copy, PCMK__XML_ENTITY_LT);
	break;
	case '>':
	g_string_append(copy, PCMK__XML_ENTITY_GT);
	break;
	case '&':
	g_string_append(copy, PCMK__XML_ENTITY_AMP);
	break;
	case '"':
	g_string_append(copy, PCMK__XML_ENTITY_QUOT);
	break;
	default:
	if (g_ascii_iscntrl(*text)) {
	g_string_append_printf(copy, "&#x%.2X;", *text);
	} else {
	g_string_append_c(copy, *text);
	}
	break;
	}
	break;

	case pcmk__xml_escape_attr_pretty:
	switch (*text) {
	case '"':
	g_string_append(copy, "\\\"");
	break;
	case '\n':
	g_string_append(copy, "\\n");
	break;
	case '\r':
	g_string_append(copy, "\\r");
	break;
	case '\t':
	g_string_append(copy, "\\t");
	break;
	default:
	g_string_append_c(copy, *text);
	break;
	}
	break;

	default: // Invalid enum value
	CRM_ASSERT(false);
	break;
	}

	text = g_utf8_next_char(text);
	}
	return g_string_free(copy, FALSE);
	}

	/*!
	* \internal
	* \brief Set a flag on all attributes of an XML element
	*
	* \param[in,out] xml XML node to set flags on
	* \param[in] flag XML private flag to set
	*/
	static void
	set_attrs_flag(xmlNode *xml, enum xml_private_flags flag)
	{
	for (xmlAttr *attr = pcmk__xe_first_attr(xml); attr; attr = attr->next) {
	pcmk__set_xml_flags((xml_node_private_t *) (attr->_private), flag);
	}
	}

	/*!
	* \internal
	* \brief Add an XML attribute to a node, marked as deleted
	*
	* When calculating XML changes, we need to know when an attribute has been
	* deleted. Add the attribute back to the new XML, so that we can check the
	* removal against ACLs, and mark it as deleted for later removal after
	* differences have been calculated.
	*
	* \param[in,out] new_xml XML to modify
	* \param[in] element Name of XML element that changed (for logging)
	* \param[in] attr_name Name of attribute that was deleted
	* \param[in] old_value Value of attribute that was deleted
	*/
	static void
	mark_attr_deleted(xmlNode new_xml, const char element, const char *attr_name,
	const char *old_value)
	{
	xml_doc_private_t *docpriv = new_xml->doc->_private;
	xmlAttr *attr = NULL;
	xml_node_private_t *nodepriv;

	// Prevent the dirty flag being set recursively upwards
	pcmk__clear_xml_flags(docpriv, pcmk__xf_tracking);

	// Restore the old value (and the tracking flag)
	attr = xmlSetProp(new_xml, (pcmkXmlStr) attr_name, (pcmkXmlStr) old_value);
	pcmk__set_xml_flags(docpriv, pcmk__xf_tracking);

	// Reset flags (so the attribute doesn't appear as newly created)
	nodepriv = attr->_private;
	nodepriv->flags = 0;

	// Check ACLs and mark restored value for later removal
	remove_xe_attr(new_xml, attr);

	crm_trace("XML attribute %s=%s was removed from %s",
	attr_name, old_value, element);
	}

	/*
	* \internal
	* \brief Check ACLs for a changed XML attribute
	*/
	static void
	mark_attr_changed(xmlNode new_xml, const char element, const char *attr_name,
	const char *old_value)
	{
	char *vcopy = crm_element_value_copy(new_xml, attr_name);

	crm_trace("XML attribute %s was changed from '%s' to '%s' in %s",
	attr_name, old_value, vcopy, element);

	// Restore the original value
	xmlSetProp(new_xml, (pcmkXmlStr) attr_name, (pcmkXmlStr) old_value);

	// Change it back to the new value, to check ACLs
	crm_xml_add(new_xml, attr_name, vcopy);
	free(vcopy);
	}

	/*!
	* \internal
	* \brief Mark an XML attribute as having changed position
	*
	* \param[in,out] new_xml XML to modify
	* \param[in] element Name of XML element that changed (for logging)
	* \param[in,out] old_attr Attribute that moved, in original XML
	* \param[in,out] new_attr Attribute that moved, in \p new_xml
	* \param[in] p_old Ordinal position of \p old_attr in original XML
	* \param[in] p_new Ordinal position of \p new_attr in \p new_xml
	*/
	static void
	mark_attr_moved(xmlNode new_xml, const char element, xmlAttr *old_attr,
	xmlAttr *new_attr, int p_old, int p_new)
	{
	xml_node_private_t *nodepriv = new_attr->_private;

	crm_trace("XML attribute %s moved from position %d to %d in %s",
	old_attr->name, p_old, p_new, element);

	// Mark document, element, and all element's parents as changed
	pcmk__mark_xml_node_dirty(new_xml);

	// Mark attribute as changed
	pcmk__set_xml_flags(nodepriv, pcmk__xf_dirty\|pcmk__xf_moved);

	nodepriv = (p_old > p_new)? old_attr->_private : new_attr->_private;
	pcmk__set_xml_flags(nodepriv, pcmk__xf_skip);
	}

	/*!
	* \internal
	* \brief Calculate differences in all previously existing XML attributes
	*
	* \param[in,out] old_xml Original XML to compare
	* \param[in,out] new_xml New XML to compare
	*/
	static void
	xml_diff_old_attrs(xmlNode old_xml, xmlNode new_xml)
	{
	xmlAttr *attr_iter = pcmk__xe_first_attr(old_xml);

	while (attr_iter != NULL) {
	const char name = (const char ) attr_iter->name;
	xmlAttr *old_attr = attr_iter;
	xmlAttr *new_attr = xmlHasProp(new_xml, attr_iter->name);
	const char *old_value = pcmk__xml_attr_value(attr_iter);

	attr_iter = attr_iter->next;
	if (new_attr == NULL) {
	mark_attr_deleted(new_xml, (const char *) old_xml->name, name,
	old_value);

	} else {
	xml_node_private_t *nodepriv = new_attr->_private;
	int new_pos = pcmk__xml_position((xmlNode*) new_attr,
	pcmk__xf_skip);
	int old_pos = pcmk__xml_position((xmlNode*) old_attr,
	pcmk__xf_skip);
	const char *new_value = crm_element_value(new_xml, name);

	// This attribute isn't new
	pcmk__clear_xml_flags(nodepriv, pcmk__xf_created);

	if (strcmp(new_value, old_value) != 0) {
	mark_attr_changed(new_xml, (const char *) old_xml->name, name,
	old_value);

	} else if ((old_pos != new_pos)
	&& !pcmk__tracking_xml_changes(new_xml, TRUE)) {
	mark_attr_moved(new_xml, (const char *) old_xml->name,
	old_attr, new_attr, old_pos, new_pos);
	}
	}
	}
	}

	/*!
	* \internal
	* \brief Check all attributes in new XML for creation
	*
	* For each of a given XML element's attributes marked as newly created, accept
	* (and mark as dirty) or reject the creation according to ACLs.
	*
	* \param[in,out] new_xml XML to check
	*/
	static void
	mark_created_attrs(xmlNode *new_xml)
	{
	xmlAttr *attr_iter = pcmk__xe_first_attr(new_xml);

	while (attr_iter != NULL) {
	xmlAttr *new_attr = attr_iter;
	xml_node_private_t *nodepriv = attr_iter->_private;

	attr_iter = attr_iter->next;
	if (pcmk_is_set(nodepriv->flags, pcmk__xf_created)) {
	const char attr_name = (const char ) new_attr->name;

	crm_trace("Created new attribute %s=%s in %s",
	attr_name, pcmk__xml_attr_value(new_attr),
	new_xml->name);

	/* Check ACLs (we can't use the remove-then-create trick because it
	* would modify the attribute position).
	*/
	if (pcmk__check_acl(new_xml, attr_name, pcmk__xf_acl_write)) {
	pcmk__mark_xml_attr_dirty(new_attr);
	} else {
	// Creation was not allowed, so remove the attribute
	xmlUnsetProp(new_xml, new_attr->name);
	}
	}
	}
	}

	/*!
	* \internal
	* \brief Calculate differences in attributes between two XML nodes
	*
	* \param[in,out] old_xml Original XML to compare
	* \param[in,out] new_xml New XML to compare
	*/
	static void
	xml_diff_attrs(xmlNode old_xml, xmlNode new_xml)
	{
	set_attrs_flag(new_xml, pcmk__xf_created); // cleared later if not really new
	xml_diff_old_attrs(old_xml, new_xml);
	mark_created_attrs(new_xml);
	}

	/*!
	* \internal
	* \brief Add an XML child element to a node, marked as deleted
	*
	* When calculating XML changes, we need to know when a child element has been
	* deleted. Add the child back to the new XML, so that we can check the removal
	* against ACLs, and mark it as deleted for later removal after differences have
	* been calculated.
	*
	* \param[in,out] old_child Child element from original XML
	* \param[in,out] new_parent New XML to add marked copy to
	*/
	static void
	mark_child_deleted(xmlNode old_child, xmlNode new_parent)
	{
	// Re-create the child element so we can check ACLs
	xmlNode *candidate = pcmk__xml_copy(new_parent, old_child);

	// Clear flags on new child and its children
	pcmk__xml_tree_foreach(candidate, reset_xml_node_flags, NULL);

	// Check whether ACLs allow the deletion
	pcmk__apply_acl(xmlDocGetRootElement(candidate->doc));

	// Remove the child again (which will track it in document's deleted_objs)
	free_xml_with_position(candidate,
	pcmk__xml_position(old_child, pcmk__xf_skip));

	if (pcmk__xml_match(new_parent, old_child, true) == NULL) {
	pcmk__set_xml_flags((xml_node_private_t *) (old_child->_private),
	pcmk__xf_skip);
	}
	}

	static void
	mark_child_moved(xmlNode old_child, xmlNode new_parent, xmlNode *new_child,
	int p_old, int p_new)
	{
	xml_node_private_t *nodepriv = new_child->_private;

	crm_trace("Child element %s with "
	PCMK_XA_ID "='%s' moved from position %d to %d under %s",
	new_child->name, pcmk__s(pcmk__xe_id(new_child), "<no id>"),
	p_old, p_new, new_parent->name);
	pcmk__mark_xml_node_dirty(new_parent);
	pcmk__set_xml_flags(nodepriv, pcmk__xf_moved);

	if (p_old > p_new) {
	nodepriv = old_child->_private;
	} else {
	nodepriv = new_child->_private;
	}
	pcmk__set_xml_flags(nodepriv, pcmk__xf_skip);
	}

	// Given original and new XML, mark new XML portions that have changed
	static void
	mark_xml_changes(xmlNode old_xml, xmlNode new_xml, bool check_top)
	{
	xmlNode *old_child = NULL;
	xmlNode *new_child = NULL;
	xml_node_private_t *nodepriv = NULL;

	CRM_CHECK(new_xml != NULL, return);
	if (old_xml == NULL) {
	pcmk__xml_mark_created(new_xml);
	pcmk__apply_creation_acl(new_xml, check_top);
	return;
	}

	nodepriv = new_xml->_private;
	CRM_CHECK(nodepriv != NULL, return);

	if(nodepriv->flags & pcmk__xf_processed) {
	/* Avoid re-comparing nodes */
	return;
	}
	pcmk__set_xml_flags(nodepriv, pcmk__xf_processed);

	xml_diff_attrs(old_xml, new_xml);

	// Check for differences in the original children
	for (old_child = pcmk__xml_first_child(old_xml); old_child != NULL;
	old_child = pcmk__xml_next(old_child)) {

	new_child = pcmk__xml_match(new_xml, old_child, true);

	if (new_child != NULL) {
	mark_xml_changes(old_child, new_child, true);

	} else {
	mark_child_deleted(old_child, new_xml);
	}
	}

	// Check for moved or created children
	new_child = pcmk__xml_first_child(new_xml);
	while (new_child != NULL) {
	xmlNode *next = pcmk__xml_next(new_child);

	old_child = pcmk__xml_match(old_xml, new_child, true);

	if (old_child == NULL) {
	// This is a newly created child
	nodepriv = new_child->_private;
	pcmk__set_xml_flags(nodepriv, pcmk__xf_skip);

	// May free new_child
	mark_xml_changes(old_child, new_child, true);

	} else {
	/* Check for movement, we already checked for differences */
	int p_new = pcmk__xml_position(new_child, pcmk__xf_skip);
	int p_old = pcmk__xml_position(old_child, pcmk__xf_skip);

	if(p_old != p_new) {
	mark_child_moved(old_child, new_xml, new_child, p_old, p_new);
	}
	}

	new_child = next;
	}
	}

	void
	xml_calculate_significant_changes(xmlNode old_xml, xmlNode new_xml)
	{
	pcmk__set_xml_doc_flag(new_xml, pcmk__xf_lazy);
	xml_calculate_changes(old_xml, new_xml);
	}

	// Called functions may set the \p pcmk__xf_skip flag on parts of \p old_xml
	void
	xml_calculate_changes(xmlNode old_xml, xmlNode new_xml)
	{
	CRM_CHECK((old_xml != NULL) && (new_xml != NULL)
	&& pcmk__xe_is(old_xml, (const char *) new_xml->name)
	&& pcmk__str_eq(pcmk__xe_id(old_xml), pcmk__xe_id(new_xml),
	pcmk__str_none),
	return);

	if(xml_tracking_changes(new_xml) == FALSE) {
	xml_track_changes(new_xml, NULL, NULL, FALSE);
	}

	mark_xml_changes(old_xml, new_xml, FALSE);
	}

	/*!
	* \internal
	* \brief Find a comment with matching content in specified XML
	*
	* \param[in] root XML to search
	* \param[in] search_comment Comment whose content should be searched for
	* \param[in] exact If true, comment must also be at same position
	*/
	xmlNode *
	pcmk__xc_match(const xmlNode root, const xmlNode search_comment, bool exact)
	{
	xmlNode *a_child = NULL;
	int search_offset = pcmk__xml_position(search_comment, pcmk__xf_skip);

	CRM_CHECK(search_comment->type == XML_COMMENT_NODE, return NULL);

	for (a_child = pcmk__xml_first_child(root); a_child != NULL;
	a_child = pcmk__xml_next(a_child)) {
	if (exact) {
	int offset = pcmk__xml_position(a_child, pcmk__xf_skip);
	xml_node_private_t *nodepriv = a_child->_private;

	if (offset < search_offset) {
	continue;

	} else if (offset > search_offset) {
	return NULL;
	}

	if (pcmk_is_set(nodepriv->flags, pcmk__xf_skip)) {
	continue;
	}
	}

	if (a_child->type == XML_COMMENT_NODE
	&& pcmk__str_eq((const char )a_child->content, (const char )search_comment->content, pcmk__str_casei)) {
	return a_child;

	} else if (exact) {
	return NULL;
	}
	}

	return NULL;
	}

	/*!
	* \internal
	* \brief Make one XML comment match another (in content)
	*
	* \param[in,out] parent If \p target is NULL and this is not, add or update
	* comment child of this XML node that matches \p update
	* \param[in,out] target If not NULL, update this XML comment node
	* \param[in] update Make comment content match this (must not be NULL)
	*
	* \note At least one of \parent and \target must be non-NULL
	*/
	void
	pcmk__xc_update(xmlNode parent, xmlNode target, xmlNode *update)
	{
	CRM_CHECK(update != NULL, return);
	CRM_CHECK(update->type == XML_COMMENT_NODE, return);

	if (target == NULL) {
	target = pcmk__xc_match(parent, update, false);
	}

	if (target == NULL) {
	pcmk__xml_copy(parent, update);

	} else if (!pcmk__str_eq((const char )target->content, (const char )update->content, pcmk__str_casei)) {
	xmlFree(target->content);
	target->content = xmlStrdup(update->content);
	}
	}

	/*!
	* \internal
	* \brief Merge one XML tree into another
	*
	* Here, "merge" means:
	* 1. Copy attribute values from \p update to the target, overwriting in case of
	* conflict.
	* 2. Descend through \p update and the target in parallel. At each level, for
	* each child of \p update, look for a matching child of the target.
	* a. For each child, if a match is found, go to step 1, recursively merging
	* the child of \p update into the child of the target.
	* b. Otherwise, copy the child of \p update as a child of the target.
	*
	* A match is defined as the first child of the same type within the target,
	* with:
	* * the \c PCMK_XA_ID attribute matching, if set in \p update; otherwise,
	* * the \c PCMK_XA_ID_REF attribute matching, if set in \p update
	*
	* This function does not delete any elements or attributes from the target. It
	* may add elements or overwrite attributes, as described above.
	*
	* \param[in,out] parent If \p target is NULL and this is not, add or update
	* child of this XML node that matches \p update
	* \param[in,out] target If not NULL, update this XML
	* \param[in] update Make the desired XML match this (must not be \c NULL)
	* \param[in] flags Group of <tt>enum pcmk__xa_flags</tt>
	*
	* \note At least one of \p parent and \p target must be non-<tt>NULL</tt>.
	* \note This function is recursive. For the top-level call, \p parent is
	* \c NULL and \p target is not \c NULL. For recursive calls, \p target is
	* \c NULL and \p parent is not \c NULL.
	*/
	static void
	update_xe(xmlNode parent, xmlNode target, xmlNode *update, uint32_t flags)
	{
	// @TODO Try to refactor further, possibly using pcmk__xml_tree_foreach()
	const char *update_name = NULL;
	const char *update_id_attr = NULL;
	const char *update_id_val = NULL;
	char *trace_s = NULL;

	crm_log_xml_trace(update, "update");
	crm_log_xml_trace(target, "target");

	CRM_CHECK(update != NULL, goto done);

	if (update->type == XML_COMMENT_NODE) {
	pcmk__xc_update(parent, target, update);
	goto done;
	}

	update_name = (const char *) update->name;

	CRM_CHECK(update_name != NULL, goto done);
	CRM_CHECK((target != NULL) \|\| (parent != NULL), goto done);

	update_id_val = pcmk__xe_id(update);
	if (update_id_val != NULL) {
	update_id_attr = PCMK_XA_ID;

	} else {
	update_id_val = crm_element_value(update, PCMK_XA_ID_REF);
	if (update_id_val != NULL) {
	update_id_attr = PCMK_XA_ID_REF;
	}
	}

	pcmk__if_tracing(
	{
	if (update_id_attr != NULL) {
	trace_s = crm_strdup_printf("<%s %s=%s/>",
	update_name, update_id_attr,
	update_id_val);
	} else {
	trace_s = crm_strdup_printf("<%s/>", update_name);
	}
	},
	{}
	);

	if (target == NULL) {
	// Recursive call
	target = pcmk__xe_first_child(parent, update_name, update_id_attr,
	update_id_val);
	}

	if (target == NULL) {
	// Recursive call with no existing matching child
	target = pcmk__xe_create(parent, update_name);
	crm_trace("Added %s", pcmk__s(trace_s, update_name));

	} else {
	// Either recursive call with match, or top-level call
	crm_trace("Found node %s to update", pcmk__s(trace_s, update_name));
	}

	CRM_CHECK(pcmk__xe_is(target, (const char *) update->name), return);

	pcmk__xe_copy_attrs(target, update, flags);

	for (xmlNode *child = pcmk__xml_first_child(update); child != NULL;
	child = pcmk__xml_next(child)) {

	crm_trace("Updating child of %s", pcmk__s(trace_s, update_name));
	update_xe(target, NULL, child, flags);
	}

	crm_trace("Finished with %s", pcmk__s(trace_s, update_name));

	done:
	free(trace_s);
	}

	/*!
	* \internal
	* \brief Delete an XML subtree if it matches a search element
	*
	* A match is defined as follows:
	* * \p xml and \p user_data are both element nodes of the same type.
	* * If \p user_data has attributes set, \p xml has those attributes set to the
	* same values. (\p xml may have additional attributes set to arbitrary
	* values.)
	*
	* \param[in,out] xml XML subtree to delete upon match
	* \param[in] user_data Search element
	*
	* \return \c true to continue traversing the tree, or \c false to stop (because
	* \p xml was deleted)
	*
	* \note This is compatible with \c pcmk__xml_tree_foreach().
	*/
	static bool
	delete_xe_if_matching(xmlNode xml, void user_data)
	{
	xmlNode *search = user_data;

	if (!pcmk__xe_is(search, (const char *) xml->name)) {
	// No match: either not both elements, or different element types
	return true;
	}

	for (const xmlAttr *attr = pcmk__xe_first_attr(search); attr != NULL;
	attr = attr->next) {

	const char *search_val = pcmk__xml_attr_value(attr);
	const char xml_val = crm_element_value(xml, (const char ) attr->name);

	if (!pcmk__str_eq(search_val, xml_val, pcmk__str_casei)) {
	// No match: an attr in xml doesn't match the attr in search
	return true;
	}
	}

	crm_log_xml_trace(xml, "delete-match");
	crm_log_xml_trace(search, "delete-search");
	pcmk__xml_free(xml);

	// Found a match and deleted it; stop traversing tree
	return false;
	}

	/*!
	* \internal
	* \brief Search an XML tree depth-first and delete the first matching element
	*
	* This function does not attempt to match the tree root (\p xml).
	*
	* A match with a node \c node is defined as follows:
	* * \c node and \p search are both element nodes of the same type.
	* * If \p search has attributes set, \c node has those attributes set to the
	* same values. (\c node may have additional attributes set to arbitrary
	* values.)
	*
	* \param[in,out] xml XML subtree to search
	* \param[in] search Element to match against
	*
	* \return Standard Pacemaker return code (specifically, \c pcmk_rc_ok on
	* successful deletion and an error code otherwise)
	*/
	int
	pcmk__xe_delete_match(xmlNode xml, xmlNode search)
	{
	// See @COMPAT comment in pcmk__xe_replace_match()
	CRM_CHECK((xml != NULL) && (search != NULL), return EINVAL);

	for (xml = pcmk__xe_first_child(xml, NULL, NULL, NULL); xml != NULL;
	xml = pcmk__xe_next(xml)) {

	if (!pcmk__xml_tree_foreach(xml, delete_xe_if_matching, search)) {
	// Found and deleted an element
	return pcmk_rc_ok;
	}
	}

	// No match found in this subtree
	return ENXIO;
	}

	/*!
	* \internal
	* \brief Replace one XML node with a copy of another XML node
	*
	* This function handles change tracking and applies ACLs.
	*
	* \param[in,out] old XML node to replace
	* \param[in] new XML node to copy as replacement for \p old
	*
	* \note This frees \p old.
	*/
	static void
	replace_node(xmlNode old, xmlNode new)
	{
	new = xmlCopyNode(new, 1);
	pcmk__mem_assert(new);

	// May be unnecessary but avoids slight changes to some test outputs
	pcmk__xml_tree_foreach(new, reset_xml_node_flags, NULL);

	old = xmlReplaceNode(old, new);

	if (xml_tracking_changes(new)) {
	// Replaced sections may have included relevant ACLs
	pcmk__apply_acl(new);
	}
	xml_calculate_changes(old, new);
	free_xml_node(old);
	}

	/*!
	* \internal
	* \brief Replace one XML subtree with a copy of another if the two match
	*
	* A match is defined as follows:
	* * \p xml and \p user_data are both element nodes of the same type.
	* * If \p user_data has the \c PCMK_XA_ID attribute set, then \p xml has
	* \c PCMK_XA_ID set to the same value.
	*
	* \param[in,out] xml XML subtree to replace with \p user_data upon match
	* \param[in] user_data XML to replace \p xml with a copy of upon match
	*
	* \return \c true to continue traversing the tree, or \c false to stop (because
	* \p xml was replaced by \p user_data)
	*
	* \note This is compatible with \c pcmk__xml_tree_foreach().
	*/
	static bool
	replace_xe_if_matching(xmlNode xml, void user_data)
	{
	xmlNode *replace = user_data;
	const char *xml_id = NULL;
	const char *replace_id = NULL;

	xml_id = pcmk__xe_id(xml);
	replace_id = pcmk__xe_id(replace);

	if (!pcmk__xe_is(replace, (const char *) xml->name)) {
	// No match: either not both elements, or different element types
	return true;
	}

	if ((replace_id != NULL)
	&& !pcmk__str_eq(replace_id, xml_id, pcmk__str_none)) {

	// No match: ID was provided in replace and doesn't match xml's ID
	return true;
	}

	crm_log_xml_trace(xml, "replace-match");
	crm_log_xml_trace(replace, "replace-with");
	replace_node(xml, replace);

	// Found a match and replaced it; stop traversing tree
	return false;
	}

	/*!
	* \internal
	* \brief Search an XML tree depth-first and replace the first matching element
	*
	* This function does not attempt to match the tree root (\p xml).
	*
	* A match with a node \c node is defined as follows:
	* * \c node and \p replace are both element nodes of the same type.
	* * If \p replace has the \c PCMK_XA_ID attribute set, then \c node has
	* \c PCMK_XA_ID set to the same value.
	*
	* \param[in,out] xml XML tree to search
	* \param[in] replace XML to replace a matching element with a copy of
	*
	* \return Standard Pacemaker return code (specifically, \c pcmk_rc_ok on
	* successful replacement and an error code otherwise)
	*/
	int
	pcmk__xe_replace_match(xmlNode xml, xmlNode replace)
	{
	/* @COMPAT Some of this behavior (like not matching the tree root, which is
	* allowed by pcmk__xe_update_match()) is questionable for general use but
	* required for backward compatibility by cib_process_replace() and
	* cib_process_delete(). Behavior can change at a major version release if
	* desired.
	*/
	CRM_CHECK((xml != NULL) && (replace != NULL), return EINVAL);

	for (xml = pcmk__xe_first_child(xml, NULL, NULL, NULL); xml != NULL;
	xml = pcmk__xe_next(xml)) {

	if (!pcmk__xml_tree_foreach(xml, replace_xe_if_matching, replace)) {
	// Found and replaced an element
	return pcmk_rc_ok;
	}
	}

	// No match found in this subtree
	return ENXIO;
	}

	//! User data for \c update_xe_if_matching()
	struct update_data {
	xmlNode *update; //!< Update source
	uint32_t flags; //!< Group of <tt>enum pcmk__xa_flags</tt>
	};

	/*!
	* \internal
	* \brief Update one XML subtree with another if the two match
	*
	* "Update" means to merge a source subtree into a target subtree (see
	* \c update_xe()).
	*
	* A match is defined as follows:
	* * \p xml and \p user_data->update are both element nodes of the same type.
	* * \p xml and \p user_data->update have the same \c PCMK_XA_ID attribute
	* value, or \c PCMK_XA_ID is unset in both
	*
	* \param[in,out] xml XML subtree to update with \p user_data->update
	* upon match
	* \param[in] user_data <tt>struct update_data</tt> object
	*
	* \return \c true to continue traversing the tree, or \c false to stop (because
	* \p xml was updated by \p user_data->update)
	*
	* \note This is compatible with \c pcmk__xml_tree_foreach().
	*/
	static bool
	update_xe_if_matching(xmlNode xml, void user_data)
	{
	struct update_data *data = user_data;
	xmlNode *update = data->update;

	if (!pcmk__xe_is(update, (const char *) xml->name)) {
	// No match: either not both elements, or different element types
	return true;
	}

	if (!pcmk__str_eq(pcmk__xe_id(xml), pcmk__xe_id(update), pcmk__str_none)) {
	// No match: ID mismatch
	return true;
	}

	crm_log_xml_trace(xml, "update-match");
	crm_log_xml_trace(update, "update-with");
	update_xe(NULL, xml, update, data->flags);

	// Found a match and replaced it; stop traversing tree
	return false;
	}

	/*!
	* \internal
	* \brief Search an XML tree depth-first and update the first matching element
	*
	* "Update" means to merge a source subtree into a target subtree (see
	* \c update_xe()).
	*
	* A match with a node \c node is defined as follows:
	* * \c node and \p update are both element nodes of the same type.
	* * \c node and \p update have the same \c PCMK_XA_ID attribute value, or
	* \c PCMK_XA_ID is unset in both
	*
	* \param[in,out] xml XML tree to search
	* \param[in] update XML to update a matching element with
	* \param[in] flags Group of <tt>enum pcmk__xa_flags</tt>
	*
	* \return Standard Pacemaker return code (specifically, \c pcmk_rc_ok on
	* successful update and an error code otherwise)
	*/
	int
	pcmk__xe_update_match(xmlNode xml, xmlNode update, uint32_t flags)
	{
	/* @COMPAT In pcmk__xe_delete_match() and pcmk__xe_replace_match(), we
	* compare IDs only if the equivalent of the update argument has an ID.
	* Here, we're stricter: we consider it a mismatch if only one element has
	* an ID attribute, or if both elements have IDs but they don't match.
	*
	* Perhaps we should align the behavior at a major version release.
	*/
	struct update_data data = {
	.update = update,
	.flags = flags,
	};

	CRM_CHECK((xml != NULL) && (update != NULL), return EINVAL);

	if (!pcmk__xml_tree_foreach(xml, update_xe_if_matching, &data)) {
	// Found and updated an element
	return pcmk_rc_ok;
	}

	// No match found in this subtree
	return ENXIO;
	}

	/*!
	* \internal
	* \brief Get next sibling XML element with the same name as a given element
	*
	* \param[in] node XML element to start from
	*
	* \return Next sibling XML element with same name
	*/
	xmlNode *
	pcmk__xe_next_same(const xmlNode *node)
	{
	for (xmlNode *match = pcmk__xe_next(node); match != NULL;
	match = pcmk__xe_next(match)) {

	if (pcmk__xe_is(match, (const char *) node->name)) {
	return match;
	}
	}
	return NULL;
	}

	/*!
	* \internal
	* \brief Initialize the Pacemaker XML environment
	*
	* Set an XML buffer allocation scheme, set XML node create and destroy
	* callbacks, and load schemas into the cache.
	*/
	void
	pcmk__xml_init(void)
	{
	// @TODO Try to find a better caller than crm_log_preinit()
	static bool initialized = false;

	if (!initialized) {
	initialized = true;

	/* Double the buffer size when the buffer needs to grow. The default
	* allocator XML_BUFFER_ALLOC_EXACT was found to cause poor performance
	* due to the number of reallocs.
	*/
	xmlSetBufferAllocationScheme(XML_BUFFER_ALLOC_DOUBLEIT);

	// Initialize private data at node creation
	xmlRegisterNodeDefault(new_private_data);

	// Free private data at node destruction
	xmlDeregisterNodeDefault(free_private_data);

	// Load schemas into the cache
	pcmk__schema_init();
	}
	}

	/*!
	* \internal
	* \brief Tear down the Pacemaker XML environment
	*
	* Destroy schema cache and clean up memory allocated by libxml2.
	*/
	void
	pcmk__xml_cleanup(void)
	{
	pcmk__schema_cleanup();
	xmlCleanupParser();
	}

	char *
	pcmk__xml_artefact_root(enum pcmk__xml_artefact_ns ns)
	{
	static const char *base = NULL;
	char *ret = NULL;

	if (base == NULL) {
	base = pcmk__env_option(PCMK__ENV_SCHEMA_DIRECTORY);
	}
	if (pcmk__str_empty(base)) {
	base = PCMK_SCHEMA_DIR;
	}

	switch (ns) {
	case pcmk__xml_artefact_ns_legacy_rng:
	case pcmk__xml_artefact_ns_legacy_xslt:
	ret = strdup(base);
	break;
	case pcmk__xml_artefact_ns_base_rng:
	case pcmk__xml_artefact_ns_base_xslt:
	ret = crm_strdup_printf("%s/base", base);
	break;
	default:
	crm_err("XML artefact family specified as %u not recognized", ns);
	}
	return ret;
	}

	static char *
	find_artefact(enum pcmk__xml_artefact_ns ns, const char path, const char filespec)
	{
	char *ret = NULL;

	switch (ns) {
	case pcmk__xml_artefact_ns_legacy_rng:
	case pcmk__xml_artefact_ns_base_rng:
	if (pcmk__ends_with(filespec, ".rng")) {
	ret = crm_strdup_printf("%s/%s", path, filespec);
	} else {
	ret = crm_strdup_printf("%s/%s.rng", path, filespec);
	}
	break;
	case pcmk__xml_artefact_ns_legacy_xslt:
	case pcmk__xml_artefact_ns_base_xslt:
	if (pcmk__ends_with(filespec, ".xsl")) {
	ret = crm_strdup_printf("%s/%s", path, filespec);
	} else {
	ret = crm_strdup_printf("%s/%s.xsl", path, filespec);
	}
	break;
	default:
	crm_err("XML artefact family specified as %u not recognized", ns);
	}

	return ret;
	}

	char *
	pcmk__xml_artefact_path(enum pcmk__xml_artefact_ns ns, const char *filespec)
	{
	struct stat sb;
	char *base = pcmk__xml_artefact_root(ns);
	char *ret = NULL;

	ret = find_artefact(ns, base, filespec);
	free(base);

	if (stat(ret, &sb) != 0 \|\| !S_ISREG(sb.st_mode)) {
	const char *remote_schema_dir = pcmk__remote_schema_dir();

	free(ret);
	ret = find_artefact(ns, remote_schema_dir, filespec);
	}

	return ret;
	}

	void
	pcmk__xe_set_propv(xmlNodePtr node, va_list pairs)
	{
	while (true) {
	const char name, value;

	name = va_arg(pairs, const char *);
	if (name == NULL) {
	return;
	}

	value = va_arg(pairs, const char *);
	if (value != NULL) {
	crm_xml_add(node, name, value);
	}
	}
	}

	void
	pcmk__xe_set_props(xmlNodePtr node, ...)
	{
	va_list pairs;
	va_start(pairs, node);
	pcmk__xe_set_propv(node, pairs);
	va_end(pairs);
	}

	int
	pcmk__xe_foreach_child(xmlNode xml, const char child_element_name,
	int (handler)(xmlNode xml, void *userdata),
	void *userdata)
	{
	xmlNode *children = (xml? xml->children : NULL);

	CRM_ASSERT(handler != NULL);

	for (xmlNode *node = children; node != NULL; node = node->next) {
	if ((node->type == XML_ELEMENT_NODE)
	&& ((child_element_name == NULL)
	\|\| pcmk__xe_is(node, child_element_name))) {
	int rc = handler(node, userdata);

	if (rc != pcmk_rc_ok) {
	return rc;
	}
	}
	}

	return pcmk_rc_ok;
	}

	// Deprecated functions kept only for backward API compatibility
	// LCOV_EXCL_START

	#include <crm/common/xml_compat.h>

	xmlNode *
	copy_xml(xmlNode *src)
	{
	xmlDoc *doc = pcmk__xml_new_doc();
	xmlNode *copy = NULL;

	copy = xmlDocCopyNode(src, doc, 1);
	pcmk__mem_assert(copy);

	xmlDocSetRootElement(doc, copy);
	return copy;
	}

	void
	crm_xml_init(void)
	{
	pcmk__xml_init();
	}

	void
	crm_xml_cleanup(void)
	{
	pcmk__xml_cleanup();
	}

	void
	pcmk_free_xml_subtree(xmlNode *xml)
	{
	free_xml_node(xml);
	}

	void
	free_xml(xmlNode *child)
	{
	pcmk__xml_free(child);
	}

	xmlNode *
	expand_idref(xmlNode input, xmlNode top)
	{
	return pcmk__xe_resolve_idref(input, top);
	}

	void
	crm_xml_sanitize_id(char *id)
	{
	char *c;

	for (c = id; *c; ++c) {
	switch (*c) {
	case ':':
	case '#':
	*c = '.';
	}
	}
	}

	void
	crm_xml_set_id(xmlNode xml, const char format, ...)
	{
	va_list ap;
	int len = 0;
	char *id = NULL;

	/* equivalent to crm_strdup_printf() */
	va_start(ap, format);
	len = vasprintf(&id, format, ap);
	va_end(ap);
	CRM_ASSERT(len > 0);

	crm_xml_sanitize_id(id);
	crm_xml_add(xml, PCMK_XA_ID, id);
	free(id);
	}

	xmlNode *
	sorted_xml(xmlNode input, xmlNode parent, gboolean recursive)
	{
	xmlNode *child = NULL;
	GSList *nvpairs = NULL;
	xmlNode *result = NULL;

	CRM_CHECK(input != NULL, return NULL);

	result = pcmk__xe_create(parent, (const char *) input->name);
	nvpairs = pcmk_xml_attrs2nvpairs(input);
	nvpairs = pcmk_sort_nvpairs(nvpairs);
	pcmk_nvpairs2xml_attrs(nvpairs, result);
	pcmk_free_nvpairs(nvpairs);

	for (child = pcmk__xe_first_child(input, NULL, NULL, NULL); child != NULL;
	child = pcmk__xe_next(child)) {

	if (recursive) {
	sorted_xml(child, result, recursive);
	} else {
	pcmk__xml_copy(result, child);
	}
	}

	return result;
	}

	// LCOV_EXCL_STOP
	// End deprecated API

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