13. The apparatus of claim 12 , wherein the first entity corresponds to a market research project, the second entity corresponds to a panelist, the fact vertices correspond to profile parameter vertices representing profile parameter values identified for the panelist, and the criteria vertices represent quota cells of market research projects.
12. An apparatus for matching a first entity to a second entity by evaluating Boolean expressions, the apparatus comprising: means for identifying one or more fact vertices for the second entity; means for generating a first set of criteria vertices by traversing a graph database constrained to the fact vertices identified for the second entity, wherein the graph database relates fact vertices to criteria vertices by edges corresponding to a Boolean expression for matching the first entity to the second entity; and for a first criteria vertex in the first set of criteria vertices: means for determining whether the first criteria vertex matches a first fact vertex among the fact vertices identified for the second entity, in response to determining the first criteria vertex matches the first fact vertex, means for assembling a second set of criteria vertices by adding the first criteria vertex to the second set of criteria vertices, or in response to determining the first criteria vertex does not match a fact vertex among the fact vertices identified for the second entity, means for retaining the second set of criteria vertices, means for determining whether the second set of criteria vertices completes the Boolean expression, and in response to determining the second set of criteria vertices completes the Boolean expression, means for completing the assembly of the second set of criteria vertices, or in response to determining the second set of criteria vertices does not complete the Boolean expression, means for processing a second criteria vertex in the first set of criteria vertices, wherein completion of an include criteria of the Boolean expression is determined separately from completion of an exclude criteria of the Boolean expression.