When querying or reasoning on metadata from the semantic web, the source of this metadata as well as a number of other characteristics (date, trust, etc.) can be of great importance. While the SPARQL query language provides a keyword to match patterns against named graphs, the RDF data model focuses on expressing triples. In many cases it is interesting to augment these RDF triples with the notion of a provenance for each triple (or set of triples), typically an IRI specifying their real (e.g. author) or virtual origin (e.g. inference engine and entailment regime). This position paper extends on a member submission from INRIA (RDF/XML Source Declaration [1]) expressing the importance for us to provide a standard mechanism in RDF to name graphs. It proposes and discusses an RDF/XML syntax extension providing an attribute to specify the provenance of triples in an RDF/XML representation.