A thesaurus is a list of terms or phrases with relationships specified among them, such as a synonym, a broader term, and a narrower term. When a user issues a search query, Oracle SES can expand the search results to include matches for the related terms.
A thesaurus contains domain-specific knowledge. You can build a thesaurus, buy an industrial-specific thesaurus, or use utilities to extract a thesaurus from a specific corpus of documents. The thesaurus must be compliant with both the ISO-2788 and ANSI Z39.19(1993) standards.
A thesaurus must be loaded in Oracle SES for thesaurus-based query expansion. If no thesaurus is loaded or if the specified term or phrase cannot be found in the loaded thesaurus, then query expansion is not possible. Oracle SES only returns documents containing the original term or phrase. The default expansion level is one.
The proper encoding of an XML document for thesaurus configuration is UTF-8, which is the Oracle SES default language setting. Ensure that the NLS_LANG environment variable setting is consistent with the XML document encoding.
Creatable
name
--NAME=object_name -n object_name
None
create delete export getAllObjectKeys update
None
The <search:thesauruses> element defines a thesaurus:
<search:thesauruses> <search:thesaurus> <search:name> <search:thesaurusContent>
Element Descriptions
Contains a <search:thesaurus> element, which describes a thesaurus.
Describes a thesaurus. It contains these child elements:
<search:name> <search:thesaurusContent>
The name of the thesaurus. This name must be DEFAULT. (Required)
The thesaurus content. (Required)
Enter each term on a separate line within a CDATA element. You can identify broader terms (BT), narrower terms (NT) and synonyms (SYN). Note the one-space indentation of the related terms:
dog BT mammal NT domestic dog NT wild dog SYN canine
This XML document defines the default thesaurus:
<?xml version="1.0" encoding="UTF-8"?>
<search:config productVersion="11.1.2.0.0" xmlns:search="http://xmlns.oracle.com/search">
<search:thesauruses>
<search:thesaurus>
<search:name>DEFAULT</search:name>
<search:thesaurusContent>
<![CDATA[
cat
SYN feline
NT domestic cat
NT wild cat
BT mammal
mammal
BT animal
domestic cat
NT Persian cat
NT Siamese cat
wild cat
NT tiger
tiger
NT Bengal tiger
dog
BT mammal
NT domestic dog
NT wild dog
SYN canine
domestic dog
NT German Shepard
wild dog
NT Dingo
]]>
</search:thesaurusContent>
</search:thesaurus>
</search:thesauruses>
</search:config>