XProc

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XProc is a W3C working draft to define a XML transformation language to define XML Pipelines.

Below is an example XProc file:

<p:pipeline name="pipeline" xmlns:p="http://www.w3.org/ns/xproc">
  <p:input port="source" primary="true"/>
  <p:input port="schemas" sequence="true"/>
  <p:output port="result">
    <p:pipe step="validated" port="result"/>
  </p:output>
 
  <p:xinclude name="included">
    <p:input port="source">
      <p:pipe step="pipeline" port="source"/>
    </p:input>
  </p:xinclude>
 
  <p:validate-with-xml-schema name="validated">
    <p:input port="source">
      <p:pipe step="included" port="result"/>
    </p:input>
    <p:input port="schema">
      <p:pipe step="pipeline" port="schemas"/>
    </p:input>
  </p:validate-with-xml-schema>
</p:pipeline>

This is a pipeline that consists of two atomic steps, XInclude and Validate. The pipeline itself has two inputs, “source” (a source document) and “schemas” (a list of W3C XML Schemas). The XInclude step reads the pipeline input “source” and produces a result document. The Validate step reads the pipeline input “schemas” and the output from the XInclude step and produces a result document. The result of the validation, “result”, is the result of the pipeline.

Here is the equivalent abbreviated XProc pipeline:

<p:pipeline name="pipeline" xmlns:p="http://www.w3.org/ns/xproc">
  <p:input port="source" primary="true"/>
  <p:input port="schemas" sequence="true"/>
  <p:output port="result"/>
 
  <p:xinclude/>
 
  <p:validate-with-xml-schema>
    <p:input port="schema">
      <p:pipe step="pipeline" port="schemas"/>
    </p:input>
  </p:validate-with-xml-schema>
</p:pipeline>