2. The method of claim 1 , further comprising generating a lattice that comprises said plurality of concepts.
2. The method of claim 1 , further comprising generating a lattice that comprises said plurality of concepts. 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.