The pipeline
<p:declare-step xmlns:p="http://www.w3.org/ns/xproc" xmlns:test="http://xproc.org/ns/testsuite/3.0/demo" xmlns:xs="http://www.w3.org/2001/XMLSchema" version="3.0">
<p:output port="result"/>
<p:declare-step type="test:test">
<p:output port="result"/>
<p:option name="option" as="map(*)" required="true"/>
<p:identity>
<p:with-input>
<result>{$option?key}</result>
</p:with-input>
</p:identity>
</p:declare-step>
<test:test option="map{'key' : 'value'}"/>
</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="result/text()='value'">The text child of root element is not 'value'.</s:assert>
</s:rule>
</s:pattern>
</s:schema>
