SEM_RDFCTX.MAINTAIN

Format

SEM_RDFCTX.MAINTAIN_TRIPLES(
     index_name     IN VARCHAR2, 
     where_clause   IN VARCHAR2, 
     rdfxml_content IN sys.XMLType, 
     policy_name    IN VARCHAR2 DEFAULT NULL, 
     action         IN VARCHAR2 DEFAULT 'ADD',
     network_owner  IN VARCHAR2 DEFAULT NULL,
     network_name   IN VARCHAR2 DEFAULT NULL);

Description

Adds one or more triples to graphs that contain information extracted from specific documents.

Parameters

index_name: Name of the semantic index for documents.
where_clause: A SQL predicate (WHERE clause text without the WHERE keyword) on the table in which the documents are stored, to identify the rows for which to maintain the index.
rdfxml_content: Triples, in the form of an RDF/XML document, to be added to the individual graphs corresponding to the documents.
policy_name: Name of the extractor policy. If policy_name is null (the default), the triples are added to the information extracted by the default (or the only) extractor policy for the index; if you specify a policy name, the triples are added to the information extracted by that policy.
action: Type of maintenance operation to perform on the triples. The only value currently supported in ADD (the default), which adds the triples that are specified in the rdfxml_content parameter.
network_owner: Owner of the semantic network. (See Table 1-2.)
network_name: Name of the semantic network. (See Table 1-2.)

Usage Notes

The information extracted from the semantically indexed documents may be incomplete and lacking in proper context. This procedure enables a domain expect to add triples to individual graphs pertaining to specific semantically indexed documents, so that all subsequent SEM_CONTAINS queries can consider these triples in their document search criteria.

This procedure accepts the index name and WHERE clause text to identify the specific documents to be annotated with the additional triples. For example, the where_clause might be specified as a simple predicate involving numeric data, such as 'docId IN (1,2,3)'.

For information about semantic network types and options, see RDF Networks.

Examples

The following example annotates a specific document with the semantic index ArticleIndex by adding triples to the corresponding individual graph.

begin
  sem_rdfctx.maintain_triples(
     index_name      => 'ArticleIndex',
     where_clause    => 'docid = 15',  
     rdfxml_content => sys.xmltype(
      '<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" 
                xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
                xmlns:pred="http://myorg.com/pred/">
       <rdf:Description rdf:about=" http://newscorp.com/Org/ExampleCorp">
         <pred:hasShortName 
               rdf:datatype="http://www.w3.org/2001/XMLSchema#string">
             Example
         </pred:hasShortName>
     </rdf:Description> 
    </rdf:RDF>'));
end;
/