Graphical rdf

Question

how i can see my oracle rdf in a graphical form
i try to use cytoscape and the NDM plugin but it don't work, it tell me that not exist a network,
what can i do to see my rdf network??, or my rdf model???
thanks

Answer 1

Hi,
You would first have to manually create the NODE$ and LINK$ views and insert metadata to see a directed logical network from an RDF model. The code for that is below. Once that is done you should be to use cytoscape to view the network.
In the example below, the name of the RDF model is 'nature'.
-- Example SQL for Creating NODE$ and LINK$ views, inserting metadata, and
-- validating network
CREATE VIEW nature_node$ AS
SELECT DISTINCT(a.start_node_id) node_id, b.value_name.getURL() node_name, a.active
FROM mdsys.rdfm_nature a, mdsys.rdf_value$ b
WHERE a.start_node_id=b.value_id
UNION
SELECT DISTINCT(c.canon_end_node_id) node_id, d.value_name.getURL() node_name, c.active
FROM mdsys.rdfm_nature c, mdsys.rdf_value$ d
WHERE c.canon_end_node_id=d.value_id ;
CREATE VIEW nature_link$ AS
SELECT a.link_id, b.value_name.getURL() link_name, a.start_node_id, a.canon_end_node_id end_node_id, a.active
FROM mdsys.rdfm_nature a, mdsys.rdf_value$ b
WHERE a.p_value_id=b.value_id ;
INSERT INTO user_sdo_network_metadata(network, network_category, node_table_name, link_table_name, link_direction)
VALUES( 'NATURE', 'LOGICAL','NATURE_NODE$', 'NATURE_LINK$', 'DIRECTED');
COMMIT;
SELECT sdo_net.validate_network('NATURE') FROM DUAL;