rdflib 4.2.2

RDFLib is a pure Python package work working with RDF. RDFLib contains most things you need to work with RDF, including:

  • parsers and serializers for RDF/XML, N3, NTriples, N-Quads, Turtle, TriX, RDFa and Microdata.
  • a Graph interface which can be backed by any one of a number of Store implementations.
  • store implementations for in memory storage and persistent storage on top of the Berkeley DB.
  • a SPARQL 1.1 implementation - supporting SPARQL 1.1 Queries and Update statements.

Indices and tables

functional properties

A functional property is a property that can have only one (unique) value y for each instance x, i.e. there cannot be two distinct values y1 and y2 such that the pairs (x,y1) and (x,y2) are both instances of this

An RDF graph is a set of RDF triples. The set of nodes of an RDF graph is the set of subjects and objects of triples in the graph.
named graph
Named Graphs is the idea that having multiple RDF graphs in a single document/repository and naming them with URIs provides useful additional functionality. – http://www.w3.org/2004/03/trix/

A property is transitive:

if whenever an element a is related to an element b, and b is in turn related to an element c, then a is also related to c. – http://en.wikipedia.org/wiki/Transitive_relation

Standard examples include rdfs:subClassOf or greater-than