Search code examples
rdf4j

RDF4J List of Valid Triple Indexes

is there a list of valid triple indexes to initialize a nativestore?

I searched in the github repo rdf4j-storage but couldn't find an enumeration or something similar.

Solution

  • Triple stores use indexes based on subject, object, predicate and context. The index structure is given by the order of the first letter of each of these words, so, for example spoc, posc (these are the most common). Any 4-letter permutation of these is accepted by RDF4J native store.

    See for example https://github.com/eclipse/rdf4j-storage/blob/master/nativerdf/src/main/java/org/eclipse/rdf4j/sail/nativerdf/TripleStore.java, method parseIndexSpecList.