SymbolicXML is Mathematica's lossless representation of XML documents.

Mathematica is naturally suited to representing and working with XML, given its tree structure and uniform expression model. But it is SymbolicXML that makes the process of working with XML documents seamless--enabling automated import and export, and providing a representation that is straightforward to work with within Mathematica.

As well as being the most comprehensive solution for analyzing data contained in XML documents, Mathematica is commonly used for working with XML documents themselves because of its highly developed rule-based transformation language.