BTG

This function returns all broader terms generic of a phrase as recorded in the specified thesaurus.

Syntax 1: Table Result

CTX_THES.BTG(restab IN OUT NOCOPY EXP_TAB,
             phrase IN VARCHAR2, 
             lvl    IN NUMBER DEFAULT 1,
             tname  IN VARCHAR2 DEFAULT 'DEFAULT');

Syntax 2: String Result

CTX_THES.BTG(phrase IN VARCHAR2, 
             lvl    IN NUMBER DEFAULT 1,
             tname  IN VARCHAR2 DEFAULT 'DEFAULT') 
RETURN VARCHAR2;

restab

Optionally, specify the name of the expansion table to store the results. This table must be of type EXP_TAB which the system defines as follows:

type exp_rec is record (
    xrel varchar2(12),
    xlevel number,
    xphrase varchar2(256)
);
type exp_tab is table of exp_rec index by binary_integer;

See Also: For more information about EXP_TAB, see "CTX_THES Result Tables and Data Types" in Appendix B, "Result Tables".

phrase

Specify phrase to lookup in thesaurus.

lvl

Specify how many levels of broader terms to return. For example 2 means get the broader terms of the broader terms of the phrase.

tname

Specify thesaurus name. If not specified, system default thesaurus is used.

Returns

This function returns a string of broader terms generic in the form:

 {bt1}|{bt2}|{bt3} ...

Example

To look up the broader terms generic for cat up to two levels, issue the following statements:

declare 
  terms varchar2(2000); 
begin 
  terms := ctx_thes.btg('CAT', 2, 'MY_THES'); 
  dbms_output.put_line('the broader expansion for CAT is: '||terms); 
end; 

Related Topics

OUTPUT_STYLE

Broader Term (BT, BTG, BTP, BTI) Operators in Chapter 4