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If you're new to the Google Data APIs, here's how we recommend you get started:
The Google Data APIs provide a simple standard protocol for reading and writing data on the web.
These REST-style APIs are based on the Atom Publishing Protocol (AtomPub), using the standard Atom syndication format to represent data and HTTP to handle communication. The Google Data API protocol also extends AtomPub for processing queries, authentication, batch requests, and providing alternate output formats (JSON, RSS).
Many Google services support the Google Data API protocol. The following Data APIs allow your client applications to interact with Google services: