Fig 1.
Ontology construction flow chart.
Fig 2.
An RDF graph and corresponding triples relationship.
Fig 3.
The data structure of Neo4j.
Fig 4.
An example of an RDF directional marker map in the oilfield ontology.
Table 1.
Relationships between concepts.
Fig 5.
Neo4j database stored procedures.
Fig 6.
Mapping of RDF directed graph to Neo4j data structure.
Table 2.
Object index.
Table 3.
Triad index.
Fig 7.
Graphic structure of multiple sets of triples in relational degree retrieval.
Table 4.
Sizes of five groups.
Fig 8.
Storage capacity comparison chart.
Fig 9.
Query time-consumption comparison chart.