xproc Component

An XML pipeline is declared in a pipeline library by a p:pipeline element.
As such, the step type is the name of the pipeline and so I do not
think we need an 'xproc' component.


-- 
--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