26. The computer of claim 25 , wherein the at least one hardware processor executes the processor executable instructions to identify the plurality of facet attributes in the plurality of keywords by: defining at least one pattern for use as criteria for identifying facet attribute candidates; applying the at least one pattern against the plurality of keywords; and based on the application of the at least one pattern, identifying a candidate set of facet attributes.
25. The computer of claim 19 , wherein the at least one hardware processor executes the processor executable instructions to identify at least one facet attribute in each of at least some of the pairs of concepts by: identifying a plurality of keywords in the at least some of the pairs of concepts; and identifying the plurality of facet attributes in the plurality of keywords.