17. The computer-readable storage medium of claim 12 and further comprising normalizing the textual adaptation data to provide words that would be spoken for portions of the textual adaptation data that do not comprise words, the portions of the textual adaptation data including punctuation marks and numeric elements.
17. The computer-readable storage medium of claim 12 and further comprising normalizing the textual adaptation data to provide words that would be spoken for portions of the textual adaptation data that do not comprise words, the portions of the textual adaptation data including punctuation marks and numeric elements. 18. The computer-readable storage medium of claim 17 wherein ascertaining includes computing a feature of the classification model for the text units of the textual adaptation data that is independent of normalization of the textual adaptation data and independent of a vocabulary.