Format

SEM_APIS.ESCAPE_CLOB_TERM(
     term        IN  CLOB CHARACTER SET ANY_CS, 
     utf_encode  IN NUMBER DEFAULT 1,
     options     IN VARCHAR2 DEFAULT NULL,
     max_vc_len  IN NUMBER DEFAULT 4000
     ) RETURN CLOB CHARACTER SET val%CHARSET;

Description

Returns the input RDF term with special characters and non-ASCII characters escaped as specified by the W3C N-Triples format (http://www.w3.org/TR/rdf-testcases/#ntriples).

Parameters

term

The RDF term to escape.

utf_encode

Set to 1 (the default) if non-ASCII characters and non-printable ASCII characters other than chr(8), chr(9), chr(10), chr(12), and chr(13) should be escaped. Otherwise, such characters will not be escaped.

options

Reserved for future use.

max_vc_len

The maximum allowed length of a VARCHAR RDF term - 32767 or 4000 (the default).

Usage Notes

For information about using the DO_UNESCAPE keyword in the options parameter of the SEM_MATCH table function, see Using the SEM_MATCH Table Function to Query RDF Data.

Examples

The following example escapes an input RDF term containing TAB and NEWLINE characters.

SELECT SEM_APIS.ESCAPE_CLOB_TERM('"abc' || chr(9) || 'def' || chr(10) || 'hij"^^<http://www.w3.org/2001/XMLSchema#string>')
  FROM DUAL;