12. A method for determination of keywords, the method comprising: determining, by a computing device, a total number of occurrences of each word of a plurality of words in a plurality of documents; determining a document-specific number of occurrences of each word in a particular document of the plurality of documents; determining a weight of meaningfulness for each word for which the document-specific number of occurrences is at least 1, wherein the weight of meaningfulness for a particular word is defined as: K ! m ! ⁢ ( K - m ) ! · 1 N m - 1 , where: K is the total number of occurrences of the particular word, m is the document-specific number of occurrences of the particular word, and N is a total number of documents; and generating a set of keywords for the particular document by adding, to the set of keywords, each word for which m≧1 and the weight of meaningfulness is less than 1.
12. A method for determination of keywords, the method comprising: determining, by a computing device, a total number of occurrences of each word of a plurality of words in a plurality of documents; determining a document-specific number of occurrences of each word in a particular document of the plurality of documents; determining a weight of meaningfulness for each word for which the document-specific number of occurrences is at least 1, wherein the weight of meaningfulness for a particular word is defined as: K ! m ! ⁢ ( K - m ) ! · 1 N m - 1 , where: K is the total number of occurrences of the particular word, m is the document-specific number of occurrences of the particular word, and N is a total number of documents; and generating a set of keywords for the particular document by adding, to the set of keywords, each word for which m≧1 and the weight of meaningfulness is less than 1. 14. The method of claim 12 , further comprising generating a respective set of keywords for each remaining document of the plurality of documents by: determining the document-specific number of occurrences of each word in each remaining document; determining the weight of meaningfulness for each word with respect to each remaining document; and generating the respective set of keywords for each remaining document by adding, to the respective set of keywords, each word for which the weight of meaningfulness is less than 1.