How to make reifications and query to obtain them

Question

Hello;
If the option expressed in the previous thread is unavailable the other option is make reifications over the triple.
There is no documentation about how to make reifications and how is expressed in a SDO_RDF_MATCH query
Can you help me ?
Regards
Isidro

Answer 1

Example: if you want to express the fact that :John :fatherOf :Matt is recorded in the document :birthCertificate, it could be done using reification as follows:
INSERT INTO family_rdf_data values(100,
SDO_RDF_TRIPLE_S('family',
'http://www.example.org/family/stmt1',
'http://www.w3.org/1999/02/22-rdf-syntax-ns#type',
'http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement'));
INSERT INTO family_rdf_data values(101,
SDO_RDF_TRIPLE_S('family',
'http://www.example.org/family/stmt1',
'http://www.w3.org/1999/02/22-rdf-syntax-ns#subject',
'http://www.example.org/family/John'));
INSERT INTO family_rdf_data values(102,
SDO_RDF_TRIPLE_S('family',
'http://www.example.org/family/stmt1',
'http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate',
'http://www.example.org/family/fatherOf'));
INSERT INTO family_rdf_data values(103,
SDO_RDF_TRIPLE_S('family',
'http://www.example.org/family/stmt1',
'http://www.w3.org/1999/02/22-rdf-syntax-ns#object',
'http:/www.example.org/family/Matt'));
INSERT INTO family_rdf_data values(104,
SDO_RDF_TRIPLE_S('family',
'http://www.example.org/family/stmt1',
'http://www.example.org/family/recordedIn',
'http://www.example.org/family/document/birthCertificate'));
A sample query involving such reified statements:
SELECT s, p, o
FROM TABLE(SDO_RDF_MATCH(
'(?stmt rdf:subject ?p) (?stmt rdf:predicate :fatherOf)
(?stmt rdf:object ?o)(?stmt :recordedIn ?s)',
SDO_RDF_Models('family'),
null,
....