47. The non-transitory computer readable storage medium as in claim 46 , wherein the instructions for formulating an expression further comprise: instructions for automatically identifying one or more phrases that correspond to a system prompt; and instructions for automatically identifying, for each of a plurality of option values, one or more phrases that correspond to the option value.
46. The non-transitory computer readable storage medium as in claim 45 , wherein one or more of the parts of the one or more Web pages comprise a system prompt indicating a type of interaction with an interactive part of a web page and a plurality of option values each representing a possible input to the interactive user interface for that type of interaction, the instructions for parsing further comprising instructions for identifying the system prompt and the plurality of option values.