SEM_APIS.REVOKE_RDF_GRAPH_ACCESS_PRIV

Format

SEM_APIS.REVOKE_RDF_GRAPH_ACCESS_PRIV(
     rdf_graph_name  IN VARCHAR2,
     user_name       IN VARCHAR2,
     privilege       IN VARCHAR2,
     user_view       IN VARCHAR2 DEFAULT NULL,
     options         IN VARCHAR2 DEFAULT NULL,
     network_owner   IN VARCHAR2 DEFAULT NULL,
     network_name    IN VARCHAR2 DEFAULT NULL);

Description

Revokes access privilege on an RDF graph or inferred graph.

Parameters

rdf_graph_name

Name of the RDF graph.

user_name

Database user that is recipient of this privilege.

privilege

Specifies the type of privilege that is granted. Currently allowed values include the following:

• QUERY: Query the RDF graph using SPARQL

• SELECT, READ: Retrieve RDF graph content using SQL. The source for the content is the RDFT_<model> view in the network owner’s schema or the view name, if any, specified for the user_view parameter.

• INSERT, UPDATE, DELETE: Perform SPARQL Update (DML) operations on the RDF graph or SQL DML operations. For SQL DML, the target object is the RDFT_<rdf_graph_name> view in the network owner’s schema.

Note: QUERY is the only valid choice if the RDF graph is not a regular graph (that is, not created using sem_apis.create_rdf_graph).

user_view

Applicable to schema-private network only. If a view was created on the RDFT_<rdf_graph_name> view at RDF graph creation time using sem_apis.create_rdf_graph or later, privilege is revoked on that view.

options

If user specifies the word ENTAILMENT as part of the string value, then the specified rdf_graph_name is taken as the name of an inferred graph (rules index). (Additional words or phrases may be allowed in future.)

network_owner

Owner of the RDF network. (See Table: network_owner and network_name Parameters.)

network_name

Name of the RDF network. (See Table: network_owner and network_name Parameters.)

Usage Notes

This does not affect the recipient’s query-only or full access to the RDF network (which guarantees access to dictionary tables, but not individual RDF graphs). This operation revokes access to the specified graph only.

Examples

The following example revokes privilege from database user USER1 for use of SPARQL query against an RDF graph named articles in the schema-private network NET1 owned by database user RDFUSER. (This example refers to the RDF graph described in Example: Using an RDF Graph for Journal Article Information.)

EXECUTE SEM_APIS.REVOKE_RDF_GRAPH_ACCESS_PRIV('articles', 'USER1', 'QUERY', network_owner=>'RDFUSER', network_name=>'NET1');