The pipeline
<p:declare-step xmlns:p="http://www.w3.org/ns/xproc" version="3.0">
<p:output port="result"/>
<p:identity>
<p:with-input>
<doc1/>
<doc2/>
<doc3/>
</p:with-input>
</p:identity>
<p:for-each>
<p:output port="result" sequence="true">
<p:inline>
<res/>
</p:inline>
<p:pipe step="id"/>
</p:output>
<p:identity name="id"/>
<p:identity>
<p:with-input>
<foo/>
</p:with-input>
</p:identity>
</p:for-each>
<p:wrap-sequence wrapper="result"/>
</p:declare-step>
Schematron validation
<s:schema xmlns="http://www.w3.org/1999/xhtml" xmlns:s="http://purl.oclc.org/dsdl/schematron" queryBinding="xslt2">
<s:pattern>
<s:rule context="/">
<s:assert test="result">The pipeline root is not result.</s:assert>
<s:assert test="count(result/*)=6">Wrapper does not have six children.</s:assert>
<s:assert test="result/*[1]/name()='res'">First child is not 'res'.</s:assert>
<s:assert test="result/*[2]/name()='doc1'">Second child is not 'doc1'.</s:assert>
<s:assert test="result/*[3]/name()='res'">Third child is not 'res'.</s:assert>
<s:assert test="result/*[4]/name()='doc2'">Forth child is not 'doc2'.</s:assert>
<s:assert test="result/*[5]/name()='res'">fifth child is not 'res'.</s:assert>
<s:assert test="result/*[6]/name()='doc3'">Sixth child is not 'doc3'.</s:assert>
</s:rule>
</s:pattern>
</s:schema>
