5. The method of claim 2 , further comprising drilling-down a subset of categories associated with said plurality of keywords to obtain a contextual information, wherein said subset of categories are arranged hierarchically, wherein said contextual information indicates an affinity among said plurality of keywords.
5. The method of claim 2 , further comprising drilling-down a subset of categories associated with said plurality of keywords to obtain a contextual information, wherein said subset of categories are arranged hierarchically, wherein said contextual information indicates an affinity among said plurality of keywords. 6. The method of claim 5 , wherein said contextual information is obtained to disambiguate said ambiguous keyword.