The pipeline
<p:declare-step xmlns:p="http://www.w3.org/ns/xproc" version="3.0">
<p:output port="result"/>
<p:namespace-delete xmlns:pre="http://dummy" prefixes="pre">
<p:with-input>
<doc xmlns="http://dummy" xmlns:other="http://other">
<section other:id="one">
<other:par>This is a para.</other:par>
<other:par>This is another para.</other:par>
</section>
<section other:id="two">
<other:par>First para.</other:par>
<other:par>Second para.</other:par>
</section>
</doc>
</p:with-input>
</p:namespace-delete>
</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:ns prefix="other" uri="http://other"/>
<s:pattern>
<s:rule context="/">
<s:assert test="/doc">The document root is not 'doc'.</s:assert>
<s:assert test="count(/doc/section)=2">Element doc does not have two children 'section'.</s:assert>
</s:rule>
<s:rule context="/doc/section">
<s:assert test="./@other:id">Section does not have an attribute 'id'.</s:assert>
<s:assert test="count(other:par)=2">Section does not have two paragraphs.</s:assert>
</s:rule>
</s:pattern>
</s:schema>
