Module rdflib.store.FOPLRelationalModel.RelationalHash

This module implements two hash tables for identifiers and values that facilitate maximal index lookups and minimal redundancy (since identifiers and values are stored once only and referred to by integer half-md5-hashes). The identifier hash uses the half-md5-hash (converted by base conversion to an integer) to key on the identifier's full lexical form (for partial matching by REGEX) and their term types. The use of a half-hash introduces a collision risk that is currently not accounted for. The volume at which the risk becomes significant is calculable, though through the 'birthday paradox'.

The value hash is keyed off the half-md5-hash (as an integer also) and stores the identifier's full lexical representation (for partial matching by REGEX)

These classes are meant to automate the creation, management, linking, insertion of these hashes (by SQL) automatically