In XML, an application may or may not know how to find the ID and/or class and/or attribute defaults of an element.
To enable matching of identity conditions, class conditions, language, and attribute defaults you need to provide an AttributeResolver to the StyleMap.
NOTE: The application is required to look in a document's internal subset for default attribute values, but the application is not required to use its built-in knowledge of a namespace or look in the external subset.
@author Torbjörn Gannholm