21. The non-transitory computer readable storage medium of claim 20 , said computer-readable storage medium further comprising: program code for analyzing the anchor text to determine if the first document contains valid data.
21. The non-transitory computer readable storage medium of claim 20 , said computer-readable storage medium further comprising: program code for analyzing the anchor text to determine if the first document contains valid data. 22. The non-transitory computer readable storage medium of claim 21 , wherein said program code for analyzing the anchor text to determine if the first document contains valid data comprises program code for comparing the anchor text to a list of known noise text.