represent XML as data structure preserving element order

 XML::Struct implements a mapping between XML and Perl data structures.
 By default, the mapping preserves element order,
 so it also suits for "document-oriented" XML.
 In short, an XML element is represented
 as array reference with three parts:
 .
   [ $name => \%attributes, \@children ]
 .
 This data structure corresponds to the abstract data model
 of MicroXML <http://www.w3.org/community/microxml/>,
 a simplified subset of XML.
 .
 If your XML documents don't contain relevant attributes,
 you can also choose to map to this format:
 .
   [ $name => \@children ]
 .
 Both parsing (with XML::Struct::Reader or function readXML)
 and serializing (with XML::Struct::Writer or function writeXML)
 are fully based on XML::LibXML,
 so performance is better than XML::Simple
 and similar to XML::LibXML::Simple.