Patent ID: 7818352

Claim:
A query conversion method for querying Resource Description Framework metadata stored in a relational database, the method comprising using a processor coupled to a memory to perform the following operations: storing the Resource Description Framework metadata as an information resource in a de-normalized table in the relational database; organizing the de-normalized table to include a Graph Table that stores named graphs with respective identification numbers, and a Statement Table that stores the information resource as a subject, predicate and object triplet; assigning to the subject, predicate and object, respectively, a corresponding subject type attribute value, predicate type attribute value and object type attribute value; assigning, to each of the subject type attribute value, predicate type attribute value and object type attribute value, a corresponding integrity check value including a checksum value; storing, in the Statement Table, an indication of whether the information resource can be reified; receiving a query substantially conforming to a Simple Protocol and Resource Description Framework Query Language, the query comprising a where clause, the where clause comprising a plurality of Resource Description Framework terms; parsing the query; converting the query into a structured query language query by applying a conversion algorithm; and querying the de-normalized table with the structured query language query.