Today's commits

Here are the changes I committed to the SVN trunk today:

filters.py and similarity.py

• Fixed the keywords.

fgdc_extractor.py
Minor bug fixes:

• Bug in dictReader() that didn't open the file if the path was passed in as a parameter.
• Bug in extract() that asked for path to hierarchy file even if a hierarchy dictionary is provided as a parameter.
  

filters.py
Added several WordNet-based functions, to retrieve the following types of related words for every word in a term description:

• hyponyms
• instance hyponyms
• member meronyms
• part meronyms
• substance meronyms
• entailments
• attibutes
• causes
• also-sees
• verb groups
• similar-tos
• pertainyms
• derivationally related forms

In each case, the results are appended to the description and the full list is returned. There is also an option to include the hyponyms/meronyms/etc for each word AND its synonyms. I've included this because there are often no results returned when only the word is considered. I'm not sure why that is- either WordNet is less rich than expected, or there's a very subtle error in the code.

TO DO

• Have a look at the WordNet hierarchy.

• Figure out why the XML output of fgdc_extractor.extract() is producing errors. Namrata has suggested that this may be due to the presence of '<' in the text.

• Write filter functions to get hypernyms and holonyms.

• Write a function to filter term descriptions and rank them relative to a given description.