15. The method of claim 14 , wherein: the parsing comprises ascertaining as iterator related field tokens the field tokens that are associated with the identified tokens that correspond to the iterating static structural elements defined in the grammar; the determining comprises choosing as iterator classification features the identified tokens corresponding to iterating static structural elements adjacent the field tokens ascertained as iterator related field tokens; and the classifying comprises labeling the field tokens ascertained as iterator related field tokens based on the respective iterator classification features.
15. The method of claim 14 , wherein: the parsing comprises ascertaining as iterator related field tokens the field tokens that are associated with the identified tokens that correspond to the iterating static structural elements defined in the grammar; the determining comprises choosing as iterator classification features the identified tokens corresponding to iterating static structural elements adjacent the field tokens ascertained as iterator related field tokens; and the classifying comprises labeling the field tokens ascertained as iterator related field tokens based on the respective iterator classification features. 16. The method of claim 15 , wherein the classifying comprises classifying each of the field tokens ascertained as iterator related field tokens as one of: a price; a quantity; and an item description.