13. A method for generating structured data, comprising: using a computer to perform steps comprising: receiving an electronic document containing unstructured data describing facts about business hours of an enterprise; extracting the unstructured data describing facts about the business hours of the enterprise from the electronic document; and receiving the extracted unstructured data and creating structured representations of the facts about the business hours of the enterprise described by the unstructured data, wherein the receiving extracted unstructured data and creating comprises: receiving a string describing facts about the business hours of the enterprise extracted from the electronic document; parsing the string to classify symbols within the string, the parsing classifying symbols within the string as representing days of the week and classifying symbols within the string as representing times of the enterprise's business hours; collapsing the symbols representing days of the week in the string to form a collapsed string, the collapsed string having a symbol representing a sequence of days and the symbols representing times of the enterprise's business hours, wherein the symbol representing the sequence of days is described in the structured representation by a vector having bits indicating days of the week on which the enterprise is open; and interpreting the symbols within the collapsed string to determine business hours for the enterprise on the days in the sequence; wherein the structured representations of the facts about the business hours of the enterprise comprise a vector describing the symbol representing the sequence of days using bits indicating days of the week on which the enterprise is open.
14. The method of claim 13 , wherein collapsing the symbols representing days of the week in the string comprises: identifying a sequence of multiple symbols representing days of the week in the string; and collapsing the sequence of multiple symbols representing days of the week into the symbol representing the sequence of days.