The automatic indexing, identified in documents abbreviate keywords that all or most of the contents of a text, what it does is to extract indexing terms automatically with the help of the machines that can be searched through lists of open set words or through a controlled indexing , and thesauruses or ontologies. To achieve automatic indexing it should index the main parts of the document such as title, subtitle, summary, author, etc.. or index the full text, but the greatest percentage of retrieval the show's indexed terms in the title, and very little in the full text.
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