SEM_APIS.VALUE_NAME

Format

SEM_APIS.VALUE_NAME_PREFIX (
     value_name  IN VARCHAR2, 
     value_type  IN VARCHAR2 
     ) RETURN VARCHAR2;

Description

Returns the value in the VNAME_PREFIX column for the specified value name and value type pair in the RDF_VALUE$ table.

Parameters

value_name: Value name. Must match a value in the VALUE_NAME column in the RDF_VALUE$ table, which is described in Statements.
value_type: Value type. Must match a value in the VALUE_TYPE column in the RDF_VALUE$ table, which is described in Statements.

Usage Notes

This function usually causes an index on the RDF_VALUE$ table to be used for processing a lookup for values, and thus can make a query run faster.

Examples

The following query returns value name portions of all the lexical values in RDF_VALUE$ table with a prefix value same as that returned by the VALUE_NAME_PREFIX function. This query uses an index on the RDF_VALUE$ table, thereby providing efficient lookup.

SELECT value_name FROM RDF_VALUE$
  WHERE vname_prefix = SEM_APIS.VALUE_NAME_PREFIX(
    'http://www.w3.org/1999/02/22-rdf-syntax-ns#type','UR');
 
VALUE_NAME
--------------------------------------------------------------------------------
http://www.w3.org/1999/02/22-rdf-syntax-ns#Alt
http://www.w3.org/1999/02/22-rdf-syntax-ns#Bag
http://www.w3.org/1999/02/22-rdf-syntax-ns#List
http://www.w3.org/1999/02/22-rdf-syntax-ns#Property
http://www.w3.org/1999/02/22-rdf-syntax-ns#Seq
http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement
http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral
http://www.w3.org/1999/02/22-rdf-syntax-ns#first
http://www.w3.org/1999/02/22-rdf-syntax-ns#nil
http://www.w3.org/1999/02/22-rdf-syntax-ns#object
http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate
http://www.w3.org/1999/02/22-rdf-syntax-ns#rest
http://www.w3.org/1999/02/22-rdf-syntax-ns#subject
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/1999/02/22-rdf-syntax-ns#value
 
15 rows selected.