diff --git a/xml/regression.sh b/xml/regression.sh
index 28d4f0a1e0..dafe4e8e98 100755
--- a/xml/regression.sh
+++ b/xml/regression.sh
@@ -1,513 +1,550 @@
 #!/bin/sh
 # Copyright 2018 Red Hat, Inc.
 # Author: Jan Pokorny <jpokorny@redhat.com>
 # Part of pacemaker project
 # SPDX-License-Identifier: GPL-2.0-or-later
 
 set -eu
 # $1=reference (can be '-' for stdin), $2=investigated
 # alt.: wdiff, colordiff, ...
 DIFF=${DIFF:-diff}
 DIFFOPTS=${DIFFOPTS--u}
 DIFFPAGER=${DIFFPAGER:-less -LRX}
 # $1=schema, $2=validated
 # alt.: jing -i
 RNGVALIDATOR=${RNGVALIDATOR:-xmllint --noout --relaxng}
 tests=  # test* names (should go first) here will become preselected default
 
 #
 # commons
 #
 
 emit_result() {
 	_er_howmany=${1:?}  # how many errors (0/anything else incl. strings)
 	_er_subject=${2:?}
 	_er_prefix=${3-}
 
 	test -z "${_er_prefix}" || _er_prefix="${_er_prefix}: "
 
 	if test "${_er_howmany}" = 0; then
 		printf "%s%s finished OK\n" "${_er_prefix}" "${_er_subject}"
 	else
 		printf "%s%s encountered ${_er_howmany} errors\n" \
 		       "${_er_prefix}" "${_er_subject}"
 	fi
 }
 
 emit_error() {
 	_ee_msg=${1:?}
 	printf "%s\n" "${_ee_msg}" >&2
 }
 
 # returns 1 + floor of base 2 logaritm for _lo0r_i in 1...255,
 # or 0 for _lo0r_i = 0
 log2_or_0_return() {
 	_lo0r_i=${1:?}
 	return $(((!(_lo0r_i >> 1) && _lo0r_i) * 1 \
                 + (!(_lo0r_i >> 2) && _lo0r_i & (1 << 1)) * 2 \
                 + (!(_lo0r_i >> 3) && _lo0r_i & (1 << 2)) * 3 \
                 + (!(_lo0r_i >> 4) && _lo0r_i & (1 << 3)) * 4 \
                 + (!(_lo0r_i >> 5) && _lo0r_i & (1 << 4)) * 5 \
                 + (!(_lo0r_i >> 6) && _lo0r_i & (1 << 5)) * 6 \
                 + (!(_lo0r_i >> 7) && _lo0r_i & (1 << 6)) * 7 \
                 + !!(_lo0r_i >> 7) * 7 ))
 }
 
 # rough addition of two base 2 logarithms
 log2_or_0_add() {
 	_lo0a_op1=${1:?}
 	_lo0a_op2=${2:?}
 
 	if test ${_lo0a_op1} -gt ${_lo0a_op2}; then
 		return ${_lo0a_op1}
 	elif test ${_lo0a_op2} -gt ${_lo0a_op1}; then
 		return ${_lo0a_op2}
 	elif test ${_lo0a_op1} -gt 0; then
 		return $((_lo0a_op1 + 1))
 	else
 		return ${_lo0a_op1}
 	fi
 }
 
 #
 # test phases
 #
 
 # -r ... whether to remove referential files as well
 # stdin: input file per line
 test_cleaner() {
 	_tc_cleanref=0
 
 	while test $# -gt 0; do
 		case "$1" in
 		-r) _tc_cleanref=1;;
 		esac
 		shift
 	done
 
 	while read _tc_origin; do
 		_tc_origin=${_tc_origin%.*}
 		rm -f "${_tc_origin}.up" "${_tc_origin}.up.err"
 		rm -f "$(dirname "${_tc_origin}")/.$(basename "${_tc_origin}").up"
 		test ${_tc_cleanref} -eq 0 \
 		  || rm -f "${_tc_origin}.ref" "${_tc_origin}.ref.err"
 	done
 }
 
 test_selfcheck() {
 	_tsc_template=
 	_tsc_validator=
 
 	while test $# -gt 0; do
 		case "$1" in
 		-o=*) _tsc_template="${1#-o=}";;
 		esac
 		shift
 	done
 	_tsc_validator="${_tsc_template:?}"
 	_tsc_validator="cibtr-${_tsc_validator%%.*}.rng"
 	_tsc_template="upgrade-${_tsc_template}.xsl"
 
 	# check schema (sub-grammar) for custom transformation mapping alone
 	${RNGVALIDATOR} 'http://relaxng.org/relaxng.rng' "${_tsc_validator}"
 	# check the overall XSLT per the main grammar + said sub-grammar
 	${RNGVALIDATOR} "xslt_${_tsc_validator}" "${_tsc_template}"
 }
 
 test_explanation() {
 	_tsc_template=
 
 	while test $# -gt 0; do
 		case "$1" in
 		-o=*) _tsc_template="upgrade-${1#-o=}.xsl";;
 		esac
 		shift
 	done
 
 	xsltproc upgrade-detail.xsl "${_tsc_template}"
 }
 
 # stdout: filename of the transformed file
 test_runner_upgrade() {
 	_tru_template=${1:?}
 	_tru_source=${2:?}  # filename
 	_tru_mode=${3:?}  # extra modes wrt. "referential" outcome, see below
 
 	_tru_ref="${_tru_source%.*}.ref"
         { test "$((_tru_mode & (1 << 0)))" -ne 0 \
 	  || test -f "${_tru_ref}.err"; } \
 	  && _tru_ref_err="${_tru_ref}.err" || _tru_ref_err=/dev/null
 	_tru_target="${_tru_source%.*}.up"
 	_tru_target_err="${_tru_target}.err"
 
 	if test $((_tru_mode & (1 << 2))) -eq 0; then
 		xsltproc "${_tru_template}" "${_tru_source}" \
 		  > "${_tru_target}" 2> "${_tru_target_err}" \
 		  || { _tru_ref=$?; echo "${_tru_target_err}"
 		       return ${_tru_ref}; }
 	else
 		# when -B (deblanked outcomes handling) requested, we:
 		# - drop blanks from the source XML
 		#   (effectively emulating pacemaker handling)
 		# - re-drop blanks from the XSLT outcome,
 		#   which is compared with referential outcome
 		#   processed with even greedier custom deblanking
 		#   (extraneous inter-element whitespace like blank
 		#   lines will not get removed otherwise, see lower)
 		xmllint --noblanks "${_tru_source}" \
 		  | xsltproc "${_tru_template}" - \
 		  > "${_tru_target}" 2> "${_tru_target_err}" \
 		  || { _tru_ref=$?; echo "${_tru_target_err}"
 		       return ${_tru_ref}; }
 		# reusing variable no longer needed
 		_tru_template="$(dirname "${_tru_target}")"
 		_tru_template="${_tru_template}/.$(basename "${_tru_target}")"
 		mv "${_tru_target}" "${_tru_template}"
 		xsltproc - "${_tru_template}" > "${_tru_target}" <<-EOF
 	<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 	<xsl:output method="xml" encoding="UTF-8" omit-xml-declaration="yes"/>
 	<xsl:template match="@*|*|comment()|processing-instruction()">
 	  <xsl:copy>
 	    <xsl:apply-templates select="@*|node()"/>
 	  </xsl:copy>
 	</xsl:template>
 	<xsl:template match="text()">
 	  <xsl:value-of select="normalize-space(.)"/>
 	</xsl:template>
 	</xsl:stylesheet>
 EOF
 	fi
 
 	# only respond with the flags except for "-B", i.e., when both:
 	# - _tru_mode non-zero
 	# - "-B" in _tru_mode is zero (hence non-zero when flipped with XOR)
 	if test "$((_tru_mode * ((_tru_mode ^ (1 << 2)) & (1 << 2))))" -ne 0; then
 		if test $((_tru_mode & (1 << 0))) -ne 0; then
 			cp -a "${_tru_target}" "${_tru_ref}"
 			cp -a "${_tru_target_err}" "${_tru_ref_err}"
 		fi
 		if test $((_tru_mode & (1 << 1))) -ne 0; then
 			"${DIFF}" ${DIFFOPTS} "${_tru_source}" "${_tru_ref}" \
 			  | ${DIFFPAGER} >&2
 			if test $? -ne 0; then
 				printf "\npager failure\n" >&2
 				return 1
 			fi
 			printf '\nIs comparison OK? ' >&2
 			if read _tru_answer </dev/tty; then
 				case "${_tru_answer}" in
 				y|yes) ;;
 				*) echo "Answer not 'y' nor 'yes'" >&2; return 1;;
 				esac
 			else
 				return 1
 			fi
 		fi
 	elif test -f "${_tru_ref}" && test -e "${_tru_ref_err}"; then
 		{ test "$((_tru_mode & (1 << 2)))" -eq 0 && cat "${_tru_ref}" \
 		    || xsltproc - "${_tru_ref}" <<-EOF
 	<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 	<xsl:output method="xml" encoding="UTF-8" omit-xml-declaration="yes"/>
 	<xsl:template match="@*|*|comment()|processing-instruction()">
 	  <xsl:copy>
 	    <xsl:apply-templates select="@*|node()"/>
 	  </xsl:copy>
 	</xsl:template>
 	<xsl:template match="text()">
 	  <xsl:value-of select="normalize-space(.)"/>
 	</xsl:template>
 	</xsl:stylesheet>
 EOF
 		} \
 		  | "${DIFF}" ${DIFFOPTS} - "${_tru_target}" >&2 \
 		  && "${DIFF}" ${DIFFOPTS} "${_tru_ref_err}" \
 		       "${_tru_target_err}" >&2
 		if test $? -ne 0; then
 			emit_error "Outputs differ from referential ones"
 			echo "/dev/null"
 			return 1
 		fi
 	else
 		emit_error "Referential file(s) missing: ${_tru_ref}"
 		echo "/dev/null"
 		return 1
 	fi
 
 	echo "${_tru_target}"
 }
 
 test_runner_validate() {
 	_trv_schema=${1:?}
 	_trv_target=${2:?}  # filename
 
 	if ! ${RNGVALIDATOR} "${_trv_schema}" "${_trv_target}" \
 	    2>/dev/null; then
 		${RNGVALIDATOR} "${_trv_schema}" "${_trv_target}"
 	fi
 }
 
 # -o= ... which conventional version to deem as the transform origin
 # -t= ... which conventional version to deem as the transform target
 # -B
 # -D
 # -G  ... see usage
 # stdin: input file per line
 test_runner() {
 	_tr_mode=0
 	_tr_ret=0
 	_tr_schema_o=
 	_tr_schema_t=
 	_tr_target=
 	_tr_template=
 
 	while test $# -gt 0; do
 		case "$1" in
 		-o=*) _tr_template="upgrade-${1#-o=}.xsl"
 		      _tr_schema_o="pacemaker-${1#-o=}.rng";;
 		-t=*) _tr_schema_t="pacemaker-${1#-t=}.rng";;
 		-G) _tr_mode=$((_tr_mode | (1 << 0)));;
 		-D) _tr_mode=$((_tr_mode | (1 << 1)));;
 		-B) _tr_mode=$((_tr_mode | (1 << 2)));;
 		esac
 		shift
 	done
 
 	if ! test -f "${_tr_schema_o:?}" || ! test -f "${_tr_schema_t:?}"; then
 		emit_error "Origin and/or target schema missing, rerun make"
 		return 1
 	fi
 
 	while read _tr_origin; do
 		printf '%-60s' "${_tr_origin}... "
 
 		# pre-validate
 		if ! test_runner_validate "${_tr_schema_o}" "${_tr_origin}"; then
 			_tr_ret=$((_tr_ret + 1)); echo "E:pre-validate"; continue
 		fi
 
 		# upgrade
 		if ! _tr_target=$(test_runner_upgrade "${_tr_template}" \
 		                 "${_tr_origin}" "${_tr_mode}"); then
 			_tr_ret=$((_tr_ret + 1));
 			test -n "${_tr_target}" || break
 			echo "E:upgrade"
 			test -s "${_tr_target}" \
 			  && { echo ---; cat "${_tr_target}" || :; echo ---; }
 			continue
 		fi
 
 		# post-validate
 		if ! test_runner_validate "${_tr_schema_t}" "${_tr_target}"; then
 			_tr_ret=$((_tr_ret + 1)); echo "E:post-validate"; continue
 		fi
 
 		echo "OK"
 	done
 
 	log2_or_0_return ${_tr_ret}
 }
 
 #
 # particular test variations
+# stdin: granular test specification(s) if any
 #
 
 test2to3() {
-	find test-2 -name '*.xml' -print | env LC_ALL=C sort \
+	_t23_pattern=
+
+	while read _t23_spec; do
+		_t23_spec=${_t23_spec%.xml}
+		_t23_spec=${_t23_spec%\*}
+		_t23_pattern="${_t23_pattern} -name ${_t23_spec}*.xml -o"
+	done
+	test -z "${_t23_pattern}" || _t23_pattern="( ${_t23_pattern%-o} )"
+
+	find test-2 -name '*.xml' ${_t23_pattern} -print | env LC_ALL=C sort \
 	  | { case " $* " in
 	      *\ -C\ *) test_cleaner;;
 	      *\ -S\ *) test_selfcheck -o=2.10;;
 	      *\ -X\ *) test_explanation -o=2.10;;
 	      *) test_runner -o=2.10 -t=3.0 "$@" || return $?;;
 	      esac; }
 }
 tests="${tests} test2to3"
 
 # -B
 # -D
 # -G  ... see usage
 cts_scheduler() {
 	_tcp_mode=0
 	_tcp_ret=0
 	_tcp_validatewith=
 	_tcp_schema_o=
 	_tcp_schema_t=
 	_tcp_template=
 
 	find ../cts/scheduler -name '*.xml' -print | env LC_ALL=C sort \
 	  | { case " $* " in
 	      *\ -C\ *) test_cleaner -r;;
 	      *\ -S\ *) emit_result "not implemented" "option -S";;
 	      *\ -X\ *) emit_result "not implemented" "option -X";;
 	      *)
 		while test $# -gt 0; do
 			case "$1" in
 			-G) _tcp_mode=$((_tcp_mode | (1 << 0)));;
 			-D) _tcp_mode=$((_tcp_mode | (1 << 1)));;
 			-B) _tcp_mode=$((_tcp_mode | (1 << 2)));;
 			esac
 			shift
 		done
 		while read _tcp_origin; do
 			_tcp_validatewith=$(xsltproc - "${_tcp_origin}" <<-EOF
 	<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 	<xsl:output method="text" encoding="UTF-8"/>
 	<xsl:template match="/">
 	  <xsl:choose>
 	    <xsl:when test="starts-with(cib/@validate-with, 'pacemaker-')">
 	      <xsl:variable name="Version" select="substring-after(cib/@validate-with, 'pacemaker-')"/>
 	      <xsl:choose>
 	        <xsl:when test="contains(\$Version, '.')">
 	          <xsl:value-of select="substring-before(\$Version, '.')"/>
 	        </xsl:when>
 	        <xsl:otherwise>
 	          <xsl:value-of select="cib/@validate-with"/>
 	        </xsl:otherwise>
 	      </xsl:choose>
 	    </xsl:when>
 	    <xsl:otherwise>
 	     <xsl:value-of select="cib/@validate-with"/>
 	    </xsl:otherwise>
 	  </xsl:choose>
 	</xsl:template>
 	</xsl:stylesheet>
 EOF
 )
 			_tcp_schema_t=${_tcp_validatewith}
 			case "${_tcp_validatewith}" in
 			1) _tcp_schema_o=1.3;;
 			2) _tcp_schema_o=2.10;;
 			# only for gradual refinement as upgrade-2.10.xsl under
 			# active development, move to 3.x when schema v4 emerges
 			3) _tcp_schema_o=2.10
 			   _tcp_schema_t=2;;
 			*) emit_error \
 			   "need to skip ${_tcp_origin} (schema: ${_tcp_validatewith})"
 			   continue;;
 			esac
 			_tcp_template="upgrade-${_tcp_schema_o}.xsl"
 			_tcp_schema_t="pacemaker-$((_tcp_schema_t + 1)).0.rng"
 			test "${_tcp_schema_o%%.*}" = "${_tcp_validatewith}" \
 			  && _tcp_schema_o="pacemaker-${_tcp_schema_o}.rng" \
 			  || _tcp_schema_o="${_tcp_schema_t}"
 
 			# pre-validate
 			if test "${_tcp_schema_o}" != "${_tcp_schema_t}" \
 			  && ! test_runner_validate "${_tcp_schema_o}" "${_tcp_origin}"; then
 				_tcp_ret=$((_tcp_ret + 1)); echo "E:pre-validate"; continue
 			fi
 
 			# upgrade
 			test "$((_tcp_mode & (1 << 0)))" -ne 0 \
 			  || ln -fs "$(pwd)/${_tcp_origin}" "${_tcp_origin%.*}.ref"
 			if ! _tcp_target=$(test_runner_upgrade "${_tcp_template}" \
 			                   "${_tcp_origin}" "${_tcp_mode}"); then
 				_tcp_ret=$((_tcp_ret + 1));
 				test -n "${_tcp_target}" || break
 				echo "E:upgrade"
 				test -s "${_tcp_target}" \
 				  && { echo ---; cat "${_tcp_target}" || :; echo ---; }
 				continue
 			fi
 			test "$((_tcp_mode & (1 << 0)))" -ne 0 \
 			  || rm -f "${_tcp_origin%.*}.ref"
 
 			# post-validate
 			if ! test_runner_validate "${_tcp_schema_t}" "${_tcp_target}"; then
 				_tcp_ret=$((_tcp_ret + 1)); echo "E:post-validate"; continue
 			fi
 
 			test "$((_tcp_mode & (1 << 0)))" -eq 0 \
 			  || mv "${_tcp_target}" "${_tcp_origin}"
 		done; log2_or_0_return ${_tcp_ret};;
 	      esac; }
 }
 tests="${tests} cts_scheduler"
 
 #
 # "framework"
 #
 
 # option-likes ... options to be passed down
 # argument-likes ... drives a test selection
 test_suite() {
 	_ts_pass=
 	_ts_select=
+	_ts_select_full=
+	_ts_test_specs=
 	_ts_global_ret=0
 	_ts_ret=0
 
 	while test $# -gt 0; do
 		case "$1" in
 		-) while read _ts_spec; do _ts_select="${_ts_spec}@$1"; done;;
 		-*) _ts_pass="${_ts_pass} $1";;
-		*) _ts_select="${_ts_select}@$1";;
+		*) _ts_select_full="${_ts_select_full}@$1"
+		   _ts_select="${_ts_select}@${1%%/*}";;
 		esac
 		shift
 	done
 	_ts_select="${_ts_select}@"
+	_ts_select_full="${_ts_select_full}@"
 
 	for _ts_test in ${tests}; do
 
-		case "${_ts_select}" in
-		*@${_ts_test}@*)
-		_ts_select="${_ts_select%@${_ts_test}@*}@${_ts_select#*@${_ts_test}@}"
-		;;
-		@) case "${_ts_test}" in test*) ;; *) continue;; esac
-		;;
-		*) continue;;
-		esac
+		while true; do
+			case "${_ts_select}" in
+			*@${_ts_test}@*)
+			_ts_select="${_ts_select%@${_ts_test}@*}"\
+"@${_ts_select#*@${_ts_test}@}"
+			;;
+			@) case "${_ts_test}" in test*) break;; *) continue 2;; esac
+			;;
+			*) continue 2;;
+			esac
+		done
+
+		_ts_test_specs=
+		while true; do
+			case "${_ts_select_full}" in
+			*@${_ts_test}/*)
+				_ts_test_full="${_ts_test}/${_ts_select_full#*@${_ts_test}/}"
+				_ts_test_full="${_ts_test_full%%@*}"
+				_ts_select_full="${_ts_select_full%@${_ts_test_full}@*}"\
+"@${_ts_select_full#*@${_ts_test_full}@}"
+				_ts_test_specs="${_ts_test_specs} ${_ts_test_full#*/}"
+			;;
+			*)
+			break
+			;;
+			esac
+		done
+
+		for _ts_test_spec in ${_ts_test_specs}; do
+			printf '%s\n' "${_ts_test_spec}"
+		done | "${_ts_test}" ${_ts_pass} || _ts_ret=$?
 
-		"${_ts_test}" ${_ts_pass} || _ts_ret=$?
 		test ${_ts_ret} = 0 \
 		  && emit_result ${_ts_ret} "${_ts_test}" \
 		  || emit_result "at least 2^$((_ts_ret - 1))" "${_ts_test}"
 		log2_or_0_add ${_ts_global_ret} ${_ts_ret}
 		_ts_global_ret=$?
 	done
 	if test "${_ts_select}" != @; then
 		emit_error "Non-existing test(s):$(echo "${_ts_select}" \
 		                                   | tr '@' ' ')"
 		log2_or_0_add ${_ts_global_ret} 1 || _ts_global_ret=$?
 	fi
 
 	return ${_ts_global_ret}
 }
 
 # NOTE: big letters are dedicated for per-test-set behaviour,
 #       small ones for generic/global behaviour
 usage() {
-	printf '%s\n  %s\n  %s\n  %s\n  %s\n  %s\n  %s\n  %s\n  %s\n' \
+	printf '%s\n  %s\n  %s\n  %s\n  %s\n  %s\n  %s\n  %s\n  %s\n  %s\n' \
 	    "usage: $0 [-{B,C,D,G,S,X}]* [-|{${tests## }}*]" \
 	    "- when no suites (arguments) provided, \"test*\" ones get used" \
 	    "- with '-' suite specification the actual ones grabbed on stdin" \
 	    "- use '-B' to run validate-only check suppressing blanks first" \
 	    "- use '-C' to only cleanup ephemeral byproducts" \
 	    "- use '-D' to review originals vs. \"referential\" outcomes" \
 	    "- use '-G' to generate \"referential\" outcomes" \
 	    "- use '-S' for template self-check (requires net access)" \
-	    "- use '-X' to show explanatory details about the upgrade"
+	    "- use '-X' to show explanatory details about the upgrade" \
+	    "- test specification can be granular, e.g. 'test2to3/022'"
 }
 
 main() {
 	_main_pass=
 	_main_bailout=0
 	_main_ret=0
 
 	while test $# -gt 0; do
 		case "$1" in
 		-h) usage; exit;;
 		-C|-G|-S|-X) _main_bailout=1;;
 		esac
 		_main_pass="${_main_pass} $1"
 		shift
 	done
 
 	test_suite ${_main_pass} || _main_ret=$?
 	test ${_main_bailout} -eq 1 && return ${_main_ret} \
 	  || test_suite -C ${_main_pass} >/dev/null || true
 	test ${_main_ret} = 0 && emit_result ${_main_ret} "Overall suite" \
 	  || emit_result "at least 2^$((_main_ret - 1))" "Overall suite"
 
 	return ${_main_ret}
 }
 
 main "$@"