= Applying an XSLT transformation =

== Simple case ==

{{{
      SRC←'C:\Temp\source.xml'
      TGT←'C:\Temp\target.txt'
      XSL←'C:\Temp\stylesheet.xsl'

      ⎕USING←'System' 'System.Xml,System.Xml.dll' 'System.Xml.Xsl,System.Xml.dll'

      xslt←⎕NEW XslCompiledTransform
      xslt.Load⊂XSL
      xslt.Transform SRC TGT
}}}


== XslCompiledTransform replaces XslTransform ==

.Net 2.0 replaced the '''!XslTransform''' class with '''!XslCompiledTransform''' ([[http://msdn.microsoft.com/en-us/library/system.xml.xsl.xslcompiledtransform.aspx|MSDN article]]), making '''!XslTransform''' obsolete.

'''!XslCompiledTransform''' is faster than its predecessor and also closes some [[http://msdn.microsoft.com/en-us/library/ms172414.aspx|security]] loopholes in its predecessor, which should be avoided.


== Processing Document Type Definitions ==

The simple example above will not process the files attached to this article. The stylesheet processor rejects the forecast.xsl stylesheet, because it contains a short [[WikiPedia:Document_Type_Definition | DTD]] section declaring an entity.

Accepting the DTD gives the stylesheet processor a bit a of a blank cheque. Entity declarations can be used to include other files. So the processor is prohibited from processing DTD by default. But this stylesheet comes from a trusted source and we want the stylesheet processor to accept it.

This is a common situation when processing your own XML files; for example, in converting [[http://www.docbook.org|DocBook]] source into either web pages or camera-ready PDF files. So this otherwise minimal example extends to permitting DTD processing.

{{{
      SRC←'C:\Temp\forecasts2008.xml'
      TGT←'C:\Temp\forecasts.inc'
      XSL←'C:\Temp\forecasts.xsl'

      xrs←⎕NEW XmlReaderSettings
      xrs.ProhibitDtd←0

      rdr←XmlReader.Create XSL xrs

      xslt←⎕NEW XslCompiledTransform
      xslt.Load rdr
      xslt.Transform SRC TGT
}}}

Author: StephenTaylor
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CategoryDotNet - CategoryDyalogDotNet - CategoryDyalogExamplesDotNet