The pipeline
<p:declare-step xmlns:c="http://www.w3.org/ns/xproc-step" xmlns:err="http://www.w3.org/ns/xproc-error" xmlns:p="http://www.w3.org/ns/xproc" version="3.0">
<p:output port="result"/>
<p:for-each>
<p:with-input port="source">
<doc1/>
<doc2/>
</p:with-input>
<p:identity/>
</p:for-each>
<p:wrap-sequence wrapper="wrapper"/>
</p:declare-step>
