The "XML::Easy::Transform::" namespace exists to contain modules that perform transformations on XML
documents, or parts thereof, in the form of XML::Easy::Element and XML::Easy::Content nodes.
XML::Easy is a collection of modules relating to the processing of XML data. It includes functions to
parse and serialise the standard textual form of XML. When XML data is not in text form, XML::Easy
processes it in an abstract syntax-neutral form, as a collection of linked Perl objects. This in-program
data format shields XML users from the infelicities of XML syntax. Modules under the
"XML::Easy::Transform::" namespace operate on XML data in this abstract structured form, not on textual
XML.
A transformation on XML data should normally be presented in the form of a function, which takes an
XML::Easy::Element node as its main parameter, and returns an XML::Easy::Element node (or "die"s on
error). The input node and output node each represent the root element of the XML document (or fragment
thereof) being transformed. These nodes, of course, contain subordinate nodes, according to the
structure of the XML data. A reference to the top node is all that is required to effectively pass the
whole document.