diff --git a/include/crm/common/rules.h b/include/crm/common/rules.h
index 5f347e65ef..2f3e3c9491 100644
--- a/include/crm/common/rules.h
+++ b/include/crm/common/rules.h
@@ -1,55 +1,108 @@
 /*
  * Copyright 2004-2023 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.
  */
 
 #ifndef PCMK__CRM_COMMON_RULES__H
 #  define PCMK__CRM_COMMON_RULES__H
 
+#include <glib.h>                   // guint, GHashTable
+#include <regex.h>                  // regmatch_t
+#include <crm/common/iso8601.h>     // crm_time_t
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 /*!
  * \file
  * \brief Scheduler API for rules
  * \ingroup core
  */
 
 /* Allowed subexpressions of a rule
  * @COMPAT This should be made internal at an API compatibility break
  */
 //!@{
 //! \deprecated For Pacemaker use only
 enum expression_type {
     pcmk__subexpr_unknown   = 0,        // Unknown subexpression type
     pcmk__subexpr_rule      = 1,        // Nested rule
     pcmk__subexpr_attribute = 2,        // Node attribute expression
     pcmk__subexpr_location  = 3,        // Node location expression
     pcmk__subexpr_datetime  = 5,        // Date/time expression
     pcmk__subexpr_resource  = 7,        // Resource agent expression
     pcmk__subexpr_operation = 8,        // Operation expression
 
 #if !defined(PCMK_ALLOW_DEPRECATED) || (PCMK_ALLOW_DEPRECATED == 1)
     not_expr        = pcmk__subexpr_unknown,
     nested_rule     = pcmk__subexpr_rule,
     attr_expr       = pcmk__subexpr_attribute,
     loc_expr        = pcmk__subexpr_location,
     role_expr       = 4,
     time_expr       = pcmk__subexpr_datetime,
     version_expr    = 6,
     rsc_expr        = pcmk__subexpr_resource,
     op_expr         = pcmk__subexpr_operation,
 #endif
 };
 //!@}
 
+//! Data used to evaluate a rule (any NULL items are ignored)
+typedef struct pcmk_rule_input {
+    // Used to evaluate date expressions
+    const crm_time_t *now; //!< Current time for rule evaluation purposes
+
+    // Used to evaluate resource type expressions
+    const char *rsc_standard;   //!< Resource standard that rule applies to
+    const char *rsc_provider;   //!< Resource provider that rule applies to
+    const char *rsc_agent;      //!< Resource agent that rule applies to
+
+    // Used to evaluate operation type expressions
+    const char *op_name;    //! Operation name that rule applies to
+    guint op_interval_ms;   //! Operation interval that rule applies to
+
+    // Remaining members are used to evaluate node attribute expressions
+
+    /*!
+     * Node attributes for rule evaluation purposes
+     *
+     * \note Though not const, this is used only with g_hash_table_lookup().
+     */
+    GHashTable *node_attrs;
+
+    // Remaining members are used only within location constraint rules
+
+    /*!
+     * Resource parameters that can be used as the reference value source
+     *
+     * \note Though not const, this is used only with g_hash_table_lookup().
+     */
+    GHashTable *rsc_params;
+
+    /*!
+     * Resource meta-attributes that can be used as the reference value source
+     *
+     * \note Though not const, this is used only with g_hash_table_lookup().
+     */
+    GHashTable *rsc_meta;
+
+    //! Resource ID to compare against a location constraint's resource pattern
+    const char *rsc_id;
+
+    //! Resource pattern submatches (as set by regexec()) for rsc_id
+    const regmatch_t *rsc_id_submatches;
+
+    //! Number of entries in rsc_id_submatches
+    int rsc_id_nmatches;
+} pcmk_rule_input_t;
+
 #ifdef __cplusplus
 }
 #endif
 
 #endif // PCMK__CRM_COMMON_RULES__H