29. The system of claim 26 , wherein the one or more linguistic features comprise one or more features selected from the group consisting of a named entity feature, a verb semantics feature, a noun semantics feature, an adjective semantics feature, an adverb semantics feature, and a syllable structure feature.
26. The system of claim 21 , wherein the comparing comprises selecting the corresponding text fragment based at least in part on a similarity measure between one or more linguistic features of the at least a portion of the input text and the corresponding text fragment.