In N3 and RDF+XML you /can/ refer to the current document as a zero-length-string-URI. eg. "" or <>. This is not recommended. If possible refer to the document it's authoritative URL. That way if it gets saved to disk and reloaded it doesn't then end up with it's URI/URL being its new filename.
<rdf:Description rdf:about=""> </rdf:Description>
→ cc:license → http://creativecommons.org/publicdomain/zero/1.0/ → cc:attributionURL → http://www.ecs.soton.ac.uk/ → cc:attributionName → "University of Southampton, School of Electronics and Computer Science"
If the RDF triples in a document are also available from a SPARQL endpoint then you can add the following relation to the boilerplate.
<void:sparqlEndpoint rdf:resource="...URL-of-SPARQL-Endpoint..." />