[CONF] Apache Sling Website: XSLT Processing Pipeline (page edited)

Tue, 07 Apr 2009 01:18:33 -0700

Page Edited : SLINGxSITE : XSLT Processing Pipeline

XSLT Processing Pipeline has been edited by Juanjo Vazquez (Apr 07, 2009).

(View changes)

Content:

In the Apache Sling Scripting W3C XML Processing Support bundle, Juanjo Vázquez has implemented XSLT processing support for Sling as another new scripting engine, based on the Cocoon 3 pipeline engine.

Intro

An XML pipeline specifies a sequence of operations to be performed on zero or more XML documents. There are a number of advantages to using pipelines above all in terms of separation of concerns. On the other hand, we talk about XSLT processing if the operations in a pipeline are performed executing or applying XSLT stylesheets.

XSLT processing support is implemented in Sling as an scripting engine bundle named Apache Sling Scripting W3C XML Processing Support. This bundle is based on the Cocoon 3 pipeline engine and uses the W3C XProc language in order to specify pipelines to be processed.

For the time being, XProc is partially implemented and it´s not clear that Sling must support all W3C recomendation yet. This could depend of concrete user requirements or use cases.

The source code is found in the contrib/scripting/xproc module.

How to Install

Install the org.apache.sling.scripting.xproc bundle in order to work with XProc. You can achieve this either building it from contrib/scripting/xproc folder in the Sling trunk or by downloading it from the Apache Snapshot repository here: org.apache.sling.scripting.xproc-2.0.0-incubator-20090403.114403-1.jar.

To deploy the bundle go to the bundles page of Apache Felix Web Console (http://localhost:8888/system/console/bundles), select the bundle file to upload, check the Start check box and click Install or Update button.

In order to check whether XProc scripting engine has been installed, go to the Script Engines page of the Apache Felix Web Console and see the entry for XProc there:

Apache Sling Scripting W3C XML Processing Support, 2.0.0-incubator-SNAPSHOT
  	Language 	XMLProc, 1.0
  	Extensions 	xpl
  	MIME Types 	application/xml
  	Names 	XProc, xml processing, xml pipeline processor 



Samples



Simple


This is just a very simple initial sample - more samples and details to come.



1. Create some content




$ curl -F sling:resourceType=xproc -F title="some title" -F text="And some text" http://admin:ad...@localhost:8888/foo





2. Create a pipeline script at /apps/xproc/xproc.xpl :




<?xml version="1.0" encoding="UTF-8"?>
<p:pipeline xmlns:p="http://www.w3.org/ns/xproc">

  <p:xslt>
    <p:input port="stylesheet">
      <p:document href="" class="code-quote">"/apps/xproc/one.xsl"/>
    </p:input>
  </p:xslt>

  <p:xslt>
    <p:input port="stylesheet">
      <p:document href="" class="code-quote">"/apps/xproc/two.xsl"/>
    </p:input>
  </p:xslt>

</p:pipeline>




3. Store the XSLT transforms in the repository:


/apps/xproc/one.xsl


<xsl:stylesheet version="1.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:template match="/">
  <one>
    <xsl:copy-of select="."/>
  </one>
</xsl:template>

</xsl:stylesheet>




/apps/xproc/two.xsl


<xsl:stylesheet version="1.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:template match="/">
  <two>
    <xsl:copy-of select="."/>
  </two>
</xsl:template>

</xsl:stylesheet>




4. Request foo.html to execute the pipeline:




$ curl http://admin:ad...@localhost:8888/foo.html

<?xml version="1.0" encoding="UTF-8"?>
<two>
  <one>
    <foo ...sling:resourceType="xproc" text="And some text" title="some title"/>
  </one>
</two>

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