a Schematron file and XML test file, illustrating how (any?) XSLT instructions inside in Schematron patterns just seem to be executed

schematron+xslt.sch

<?xml version="1.0" encoding="UTF-8"?>
<sch:schema xmlns:sch="http://purl.oclc.org/dsdl/schematron" queryBinding="xslt2"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:local="local">
  
  <!-- all XSLT -->
  <xsl:variable name="test">test value</xsl:variable>
  
  <xsl:template name="get.test">
    <xsl:value-of select="local:get.test()"/>
  </xsl:template>
  
  <xsl:function name="local:get.test">
    <xsl:value-of select="$test"/>
  </xsl:function>
  
  <!-- a dummy Schematron pattern that will always trigger for the document node, just to show how various XSLT instructions seem to be executed in Schematron without problem. -->
  <sch:pattern>
    <sch:rule context="/*">
      <sch:report test="true() or false()">
        This rule will always fire, demonstrating how XSLT instructions seem to be executed without problems in Schematron. For example, the named template "get.test" will execute the function "local:get.test()" which will retrieve the value of the variable $test, namely: '<xsl:for-each select="."><xsl:call-template name="get.test"/></xsl:for-each>' 
      </sch:report>
    </sch:rule>
  </sch:pattern>   
</sch:schema>

test.xml

<?xml version="1.0" encoding="UTF-8"?>
<?xml-model href="schematron+xslt.sch" type="application/xml" schematypens="http://purl.oclc.org/dsdl/schematron"?>
<test/>