125. A method of indexing and searching timed media files, as recited in claim 1 , further comprising the use of a quantitative model of semantic relatedness between at least one pair of information representations.
138. A method of indexing and searching timed media files, as recited in claim 125 , wherein said calculation of at least one relevance interval for a given information representation includes the expansion of relevance intervals to include content that contains information representations that have a sufficiently high degree of semantic relatedness with the said information representation.