The pipeline
<p:declare-step xmlns:err="http://www.w3.org/ns/xproc-error" xmlns:p="http://www.w3.org/ns/xproc" name="main" version="3.0">
<p:input port="source"/>
<p:output port="result"/>
<p:count limit="2">
<p:with-input>
<doc/>
</p:with-input>
<p:with-option name="limit" select="1"/>
</p:count>
</p:declare-step>
