The pipeline
<p:declare-step xmlns:cx="http://xmlcalabash.com/ns/extensions" xmlns:err="http://www.w3.org/ns/xproc-error" xmlns:ex="http://example.com/ns/step" xmlns:p="http://www.w3.org/ns/xproc" version="3.0">
<p:output port="result"/>
<!-- h/t to Amanda Galtman for the test -->
<p:try>
<p:error name="my-error" code="ex:first-code">
<p:with-input port="source">
<p:inline>
<doc1/>
</p:inline>
<p:inline>
<doc2/>
</p:inline>
<p:inline>
<doc3/>
</p:inline>
</p:with-input>
</p:error>
<p:catch name="catch">
<p:identity>
<p:with-input pipe="error@catch"/>
</p:identity>
</p:catch>
</p:try>
</p:declare-step>
Schematron validation
<s:schema xmlns:s="http://purl.oclc.org/dsdl/schematron" queryBinding="xslt2">
<s:ns prefix="c" uri="http://www.w3.org/ns/xproc-step"/>
<s:ns prefix="cx" uri="http://xmlcalabash.com/ns/extensions"/>
<s:pattern>
<s:rule context="/">
<s:assert test="c:errors">The document is wrong</s:assert>
</s:rule>
</s:pattern>
<s:pattern>
<s:rule context="/c:errors">
<s:assert test="count(c:error) = 1">Wrong number of errors</s:assert>
<s:assert test="c:error/@name = 'my-error'">Wrong error</s:assert>
<s:assert test="count(c:error/* except c:error/cx:*) = 3">Wrong number of documents</s:assert>
</s:rule>
</s:pattern>
</s:schema>
