Note:
TheCTX_ENTITY package is not available with release 11.2.0.3.The CTX_ENTITY package enables you to search for terms that are unknown to you without specifying a particular search text. It does this by identifying names, places, dates, and other objects when they are mentioned in a document and tagging each occurrence (called a mention) with its type and subtype. This process enables you to produce a structured view of a document that can later be used for text/data mining and more comprehensive intelligence analysis.
For complete description of this package within the context of Oracle Text, see CTX_ENTITY in the Oracle Text Reference.