The type Attribute of the source Element

The “type” attribute of the <source> element specifies the type of transformation contained in the named file.

A value of “PERL” indicates a Perl5-based transform similar to that of the <subst> element. In this case, the named file should have format similar to the following:

<?xml version='1.0'?>
<transform>
	<subst match=”127\.0\.0\.(\d+)” replace=”10.10.0.$1” />
</transform> 

Perl-type external transform files may contain any number of <subst> elements.

A value of “XSLT” indicates an XSLT transform. In this case the named file contains a standard XSLT version 1.0 transform as defined by the namespace “http://www.w3.org/1999/XSL/Transform”. Note that unlike inline transforms which only allow the XSLT <stylesheet> element, XSLT transforms contained in external source files may include any valid top-level XSLT transform element including <stylesheet>, <transform>, and simplified XSLT syntax as described in section 2.3 of the XSLT specification.