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Every nanopublication has four parts, called graphs. The assertion holds the actual content. The provenance says where that content comes from: who asserted it, what it was derived from. The publication info describes the nanopublication itself: when it was created, by whom, under which license, and its digital signature. The head is a short list that names the other three.
\nIn the RDF this looks like:
\nthis: a np:Nanopublication ; np:hasAssertion sub:assertion ; np:hasProvenance sub:provenance ; np:hasPublicationInfo sub:pubinfo .