This is very little different from the identity
pipeline, in that it has only a single identity component, but it begins
with a preprocessor call to sx, which converts SGML to XML and
preserves all undefined entity references. You can see below both the XML
form and a snapshot of the pipeline authoring tool for this pipeline.
<p0:pipeline xmlns:p0="http://www.w3.org/2002/02/xml-pipeline"
preprocess="./sx">
<p0:processdef name="identity" definition="MT_Identity"/>
<p0:process type="identity">
<p0:input label="$IN"/>
<p0:output label="$OUT"/>
</p0:process>
</p0:pipeline>