The pipeline
<p:declare-step xmlns:c="http://www.w3.org/ns/xproc-step" xmlns:p="http://www.w3.org/ns/xproc" version="3.0">
<p:output port="result"/>
<p:archive>
<p:with-input port="source">
<p:empty/>
</p:with-input>
<p:with-input port="manifest">
<c:archive>
<c:entry name="one.xml" href="../documents/ab-doc.xml"/>
<c:entry name="two.xml" href="../documents/ab-doc2.xml"/>
</c:archive>
</p:with-input>
<p:with-input port="archive">
<p:empty/>
</p:with-input>
</p:archive>
<p:unarchive relative-to="folder"/>
<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">Root element is not result.</s:assert>
<s:assert test="count(result/doc)=2">Root element does not have two child 'doc'.</s:assert>
<s:assert test="count(result/doc/@att)=1">There is no doc with @att.</s:assert>
</s:rule>
</s:pattern>
</s:schema>
