Resource description framework (rdf) is a standard model for data interchange on the web.

extensible resource descriptor (xrd) is an xml format for discovery of metadata about a resource ?? in particular discovery of services associated with the resource. it is commonly used in relation to openid, yadis and oauth.

while xrd has a rather different history, it turns out it can mostly be thought of as a serialisation format for a limited subset of rdf.

this package ignores the order of elements, as rdf is a graph format with no concept of statements coming in an "order". the xrd spec says that grokking the order of elements is only a should. that said, if you're concerned about the order of elements, the callback routines allowed by this package may be of use.

this package aims to be roughly compatible with rdf::rdfa::parser's interface.