details on the following Natural Language Processing terms ?

Posted by wefwgeweg on Stack Overflow See other posts from Stack Overflow or by wefwgeweg
Published on 2010-04-21T01:22:26Z Indexed on 2010/04/21 1:33 UTC
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Named Entity Extraction (extract ppl, cities, organizations)
Content Tagging (extract topic tags by scanning doc)
Structured Data Extraction
Topic Categorization (taxonomy classification by scanning doc....bayesian )
Text extraction (HTML page cleaning)

are there libraries that i can use to do any of the above functions of NLP ?

dont really feel like forking out cash to AlchemyAPI

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