Object metamodel comprising views on a join graph

An information retrieval service system for executing a database search of structured data objects, where each object can be represented as a join graph, the information retrieval service system comprising:

• an index server having an attribute engine configured to execute the database search, and a meta engine configured to process a query related to the database search, the meta engine configuring the query according to a metamodel, the metamodel comprising:
• an index structure having a plurality of indexes, each index having one or more tables;
• a set of join conditions that specify a relationships between the indexes, each join condition including a join path that originates on an anchor table and ends on one of the plurality of indexes;
• and
• at least one view representing a subgraph of the join graph having at least one anchor table as a key.

A computer-implemented method of executing a database search of structured data objects, where each object can be represented as a join graph, the method comprising:

• receiving a query requesting the database search of structured data objects;
• and
• redefining the query according to a metamodel, the metamodel including:
• an index structure having a plurality of indexes, each index having one or more tables;
• a set of join conditions that specify a relationships between the indexes, each join condition including a join path that originates on an anchor table and ends on one of the plurality of indexes;
• and
• at least one view representing a subgraph of the join graph having at least one anchor table as a key.