Test a p:variable selecting @pipe with neither port nor step.
Test ab-variable-035.xml is expected to pass.
<p:declare-step xmlns:p="http://www.w3.org/ns/xproc" version="3.0">
<p:output port="result"/>
<p:identity name="first">
<p:with-input>
<doc>value</doc>
</p:with-input>
</p:identity>
<p:variable name="var" select="/doc/text()" pipe=""/>
<p:identity>
<p:with-input>
<doc>{$var}</doc>
</p:with-input>
</p:identity>
</p:declare-step>
<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="doc">The pipeline root is not doc.</s:assert>
<s:assert test="count(doc/node())=1">The root element does not have exactly one child.</s:assert>
<s:assert test="count(doc/text())=1">The root element does not have exactly one text child.</s:assert>
<s:assert test="doc/text()='value'">The root element does not have a text child 'value'.</s:assert>
</s:rule>
</s:pattern>
</s:schema>
Added attribute 'queryBinding' to schematron's schema.
Some tests fro p:variable