The CONTEXT grammar is the default grammar for CONTAINS. With this grammar, you can add complexity to your searches with operators. You use the query operators in your query expression. For example, the logical operator AND enables you to search for all documents that contain two different words. The ABOUT operator enables you to search on concepts.
You can also use the WITHIN operator for section searching, the NEAR operator for proximity searches, the stem, fuzzy, and thesaural operators for expanding a query expression.
With CONTAINS, you can also use the CTXCAT grammar with the query template feature.
The following sections describe some of the Oracle Text operators.
Oracle Text Reference for complete information about using query operators