For the RDF/XML round-tripping to work effectively, I need to be able to select only nodes that are the subject of a triple. Taking a leaf out of Sean B. Palmer's excellent RDFPath proposal, I'm introducing a subject() node specifier:

subject()

A node specifier that matches only resources that are the subject of a triple.

Here are some examples of how it would be used in nodepaths:

/subject()

A globally scoped NodePath that selects all nodes in the context graph that are the subject of any triple in that graph.

resource('http://example.com/')

A locally scoped NodePath that selects the context node only if it has the given uriref and is the subject of any triple in the graph.

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