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1. original template: <?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
    <xsl:template match="*">
	<xsl:value-of select="."/>
    </xsl:template>
</xsl:stylesheet>

transform OK: 1

2. libxml modifies template: <?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"><xsl:template match="*"><xsl:value-of select="."/></xsl:template></xsl:stylesheet>

but transform OK as we cache compiled one: 2

3. after manual template modification: <?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"><xsl:template match="*">test</xsl:template></xsl:stylesheet>

transform still OK: test

4. new templates are ignored: <?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"><xsl:template match="*">test</xsl:template><xsl:template match="root">works if used before first transform</xsl:template></xsl:stylesheet>

transform: test