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Ancestor for file-based stopword schemes.
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Applies the specified stopwords algorithms one after other.
As soon as a word has been identified as stopword, the loop is exited.
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Dummy stopwords scheme, always returns false.
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Stopwords list based on Rainbow:
http://www.cs.cmu.edu/~mccallum/bow/rainbow/
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Uses the regular expressions stored in the file for determining whether a word is a stopword (ignored if pointing to a directory).
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Uses the stopwords located in the specified file (ignored _if pointing to a directory).