O'Reilly logo

Building the Unstructured Data Warehouse: Architecture, Analysis, and Design by Krish Krishnan, W. H. Inmon

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Another parametric possibility is that of negativity exclusion. In negativity exclusion, an index entry is NOT created if, in the raw text that is being processed, the word is preceded by a negative word, usually “no” or “not”. In negativity exclusion, no index entry is created if a negative word precedes it in a sentence.

It is one thing to index a word, but occasionally you do not want to index it if it is used in the context of a negative expression. Negativity exclusion is useful in the case where only positive references are to be indexed. In some cases the negativity is obvious, while in others, it is difficult to detect. For example, this phrase would not be indexed due to negative exclusion: “It was certainly not ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required