12. The method of claim 11 , wherein the distance between a child and an occurrence of the atomic search term is a selected one of a maximum, a minimum or an arithmetic mean of the distances between the child and sub-parts of the atomic search term.
11. The method of claim 8 , wherein the generating of a score for a structure further comprises assigning relevance values to children of the aggregate by assigning a child (i) a relevance value of 0 if the aggregate contains no occurrences of the atomic search term, and (ii) a relevance value of Σ 1≦i≦k (1/(1+d i ) x ) if the aggregate contains at least one occurrence of the atomic search term, where k is the number of occurrences of the atomic search term in the aggregate, x is a “distance attenuation exponent”, a positive real number, and d i is the distance between a child or sub-constituent and the i-th occurrence of the atomic search term.