128. A method of indexing and searching timed media files, as recited in claim 127 , wherein said model of semantic relatedness includes a measure of the mutual information, or probability of co-occurrence of the pair of information representations relative to the probability of random co-occurrence of such a pair of information representations, between the pair of information representations.
128. A method of indexing and searching timed media files, as recited in claim 127 , wherein said model of semantic relatedness includes a measure of the mutual information, or probability of co-occurrence of the pair of information representations relative to the probability of random co-occurrence of such a pair of information representations, between the pair of information representations. 129. A method of indexing and searching timed media files, as recited in claim 128 , wherein frequency of co-occurrence is measured as the number of occurrences of both information representations within a certain textual or temporal distance.