RDF/XML parser - default (name rdfxml)

## RDF/XML parser - default (name `rdfxml`)

A parser for the standard RDF/XML syntax as revised by the W3C RDF Core working group.

This is the default parser in Raptor.

Features of this parser:

- Fully handles the RDF/XML syntax updates for XML Base, `xml:lang`, RDF datatyping and Collections.

- Handles all RDF vocabularies such as FOAF, RSS 1.0, Dublin Core, OWL, DOAP

- Handles `rdf:resource` / `resource` attributes

- Uses expat and/or (GNOME) libxml XML parsers as available or required