The simplest possible pipeline has only a single component, which simply passes its input infoset through to its output. You can see below both the XML form and a snapshot of the pipeline authoring tool for this pipeline.
<p:pipeline xmlns:p="http://www.w3.org/2002/02/xml-pipeline"> <p:processdef name="identity" definition="MT_Identity"/> <p:process type="identity"> <p:input label="$IN"/> <p:output label="$OUT"/> </p:process> </p:pipeline>