Basics
hCal_sample.JPG

Operator (created by Mike Kaply) is an extension for Firefox that adds the ability to interact with semantic data on web pages. For instance, it lets you add an event described on a web page to your calendar. Or someone could write a user script to lookup flights/hotel rooms for the event. Such events are described using the hCalendar microformat. More microformats are under various stages of definition.

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