Use Case 5.4 - Document Aggregation

<?xml version="1.0" encoding="UTF-8"?>
<p:declare-step xmlns:p="http://www.w3.org/ns/xproc"
    xmlns:c="http://www.w3.org/ns/xproc-step" version="1.0">
   <p:input port="source" sequence="true"/>
   <p:output port="result"/>
   <p:wrap-sequence wrapper="collection"/>
</p:declare-step>

-- 
--Alex Milowski
"The excellence of grammar as a guide is proportional to the paucity of the
inflexions, i.e. to the degree of analysis effected by the language
considered."

Bertrand Russell in a footnote of Principles of Mathematics