When you create an index of type CONTEXT, you must use the CONTAINS operator to enter your query. An index of type CONTEXT is suited for indexing collections of large coherent documents.
With the CONTAINS operator, you can use a number of operators to define your search criteria. These operators enable you to enter logical, proximity, fuzzy, stemming, thesaurus and wildcard searches. With a correctly configured index, you can also enter section searches on documents that have internal structure such as HTML and XML.
With CONTAINS, you can also use the ABOUT operator to search on document themes.