7. The system of claim 6 , wherein the relevance score is calculated using the ratio of the first sum to the sum of the first sum and the second sum.
6. The system of claim 5 , wherein the computer processing system is further configured to sum the frequencies of the property names in the first group in the document to produce a first sum and to sum the frequencies of property names in the second group in the document to produce a second sum, where the relevance score is calculated using the first sum and the second sum.