Another patent via Gary Price, this time from Google:
Markup Language for Interactive Geographic Information System (filed June 12, 2007)
"Data-driven guarded evaluation of conditional-data associated with data objects is used to control activation and processing of the data objects in an interactive geographic information system. Methods of evaluating conditional-data to control activation of the data objects are disclosed herein. Data-structures to specify conditional data are also disclosed herein."
I don't really get this - but I think it's about giving the user more control of the display of large data sets. Perhaps readers can help me out?