XProc

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XProc

Filename extension .xpl

Internet media type application/xml

Developed by World Wide Web Consortium

Type of format Stylesheet language

Extended from XML

Standard(s) 1.0 (Working Draft)

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="schemas" sequence="true"/>
 
  <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, â€œsourceâ€ (a source document) and â€œschemasâ€ (a list of W3C XML Schemas). The XInclude step reads the pipeline input â€œsourceâ€ and produces a result document. The Validate step reads the pipeline input â€œschemasâ€ and the output from the XInclude step and produces a result document. The result of the validation, â€œresultâ€, 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="schemas" sequence="true"/>
 
  <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>