XSLT add attributes to processed nodes - xslt

Question

this is sample xml:
<?xml version="1.0" encoding="UTF-8"?>
<databaseChangeLog xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.6.xsd
http://www.liquibase.org/xml/ns/dbchangelog">
<changeSet id="1" author="a">
<createTable tableName="TABLE1">
<column>
</column>
</createTable>
</changeSet>
<changeSet id="1-1" author="a">
<createSequence sequenceName="SEQ_TABLE1" />
</changeSet>
<changeSet id="4" author="A">
<createTable tableName="TABLE4">
<column>
</column>
</createTable>
</changeSet>
</databaseChangeLog>
this is template:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:transform version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xpath-default-namespace="http://www.liquibase.org/xml/ns/dbchangelog">
<xsl:output method="xml" indent="yes" omit-xml-declaration="yes"/>
<xsl:variable name="coreTables" select="('TABLE1','TABLE2')"/>
<xsl:template match="node()[not(self::*)]">
<xsl:copy>
<xsl:apply-templates/>
</xsl:copy>
</xsl:template>
<xsl:template match="*">
<xsl:element name="{local-name()}">
<xsl:apply-templates select="node()|#*"/>
</xsl:element>
</xsl:template>
<xsl:template match="#*">
<xsl:attribute name="{local-name()}">
<xsl:value-of select="."/>
</xsl:attribute>
</xsl:template>
<xsl:template match="databaseChangeLog">
<!-- CORE-->
<xsl:comment>CORE TABLES</xsl:comment>
<xsl:variable name="coreTablesVariable" select="changeSet[createTable/#tableName=$coreTables]"/>
<xsl:comment>CORE SEQUENCES</xsl:comment>
<xsl:variable name="coreSequencesVariable" select="changeSet[createSequence[starts-with(#sequenceName, 'SEQ_') and substring-after(#sequenceName, 'SEQ_') = $coreTables]]"/>
<xsl:comment>CORE INDEXES</xsl:comment>
<xsl:variable name="coreIndexesVariable" select="changeSet[createIndex/#tableName=$coreTables]"/>
<xsl:comment>CORE FOREIGN CONSTRAINTS</xsl:comment>
<xsl:variable name="coreForeignConstraintsVariable" select="changeSet[addForeignKeyConstraint/#baseTableName=$coreTables]"/>
<xsl:comment>CORE VIEWS</xsl:comment>
<xsl:variable name="coreViewsVariable" select="changeSet[createView/#viewName=$coreTables]"/>
<xsl:call-template name="createChangeLog">
<xsl:with-param name="outputFile" select="'core-changelog.xml'"/>
<xsl:with-param name="changeLogContent" select="$coreTablesVariable,$coreSequencesVariable,$coreIndexesVariable,$coreForeignConstraintsVariable,$coreViewsVariable"/>
</xsl:call-template>
<xsl:comment>UNMATCHED</xsl:comment>
<xsl:variable name="unmatchedChangeSets"
select="changeSet[not(some $set in ($coreTablesVariable | $coreSequencesVariable | $coreIndexesVariable |$coreForeignConstraintsVariable |$coreViewsVariable) satisfies $set is .)]"/>
<xsl:call-template name="createChangeLog">
<xsl:with-param name="outputFile" select="'unmatched-changes-changelog.xml'"/>
<xsl:with-param name="changeLogContent" select="$unmatchedChangeSets"/>
</xsl:call-template>
</xsl:template>
<xsl:template name="createChangeLog">
<xsl:param name="outputFile"/>
<xsl:param name="changeLogContent"/>
<xsl:result-document encoding="UTF-8" indent="true" method="xml" href="{$outputFile}">
<databaseChangeLog xmlns="http://www.liquibase.org/xml/ns/dbchangelog" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.6.xsd http://www.liquibase.org/xml/ns/dbchangelog" logicalFilePath="TODO">
<xsl:copy-of select="$changeLogContent"/>
</databaseChangeLog>
</xsl:result-document>
</xsl:template>
</xsl:transform>
I'd like to add to output xml processed inside createChangelogTemplate to each element <changeSet> another attribute (context="legacy"). I was trying to add another template which matches databaseChangelog/changeSet with additional xsl:attribute element but that didn't worked for me. If is there way how to do this in one place that would be nice, because I will need to prepare more sections like CORE.
When I've added template:
<xsl:template match="changeSet" mode="legacy">
<xsl:copy>
<xsl:copy-of select="#*"/>
<xsl:attribute name="context">legacy</xsl:attribute>
<xsl:copy-of select="node()"/>
</xsl:copy>
</xsl:template>
and replaced <xsl:copy-of select="$changeLogContent"/> with <xsl:apply-templates select="$changeLogContent" mode="legacy"/> then output file core-changelog.xml was ok but file unmatched-changes-changelog.xml had no elements.
I'm using xslt 2.0 and saxon 9.8he.

Answer 1

When I run this I get changeSets 1 and 1-1 in core-changelog.xml, and changeSet 4 in unmatched-changelog.xml.
If you're still seeing nothing in unmatched-changelog then we need to look in more detail at exactly how you were running it.
Incidentally the selection of unmatched elements could be done as
select="changeSet except ($coreTablesVariable | $coreSequencesVariable | $coreIndexesVariable |$coreForeignConstraintsVariable |$coreViewsVariable)"/>