14. The apparatus of claim 13 , wherein some of the links of the semantic network are visible in the portion of the semantic network and others of the links are not visible in the portion of the semantic network.
16. The apparatus of claim 14 , wherein the second data represents an ordered stack of a plurality of variants, and wherein the processor is further configured to determine the portion of the semantic network such that some of the links are visible and others of the links are not visible, depending upon both whether the variants that condition the links are included in the second data and an order of the variants in the stack.