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"The Open Data Protocol (OData) is a Web protocol for querying and updating data that provides a way to unlock your data and free it from silos that exist in applications today. OData does this by applying and building upon Web technologies such as HTTP, Atom Publishing Protocol (AtomPub) and JSON to provide access to information from a variety of applications, services, and stores. The protocol emerged from experiences implementing AtomPub clients and servers in a variety of products over the past several years. OData is being used to expose and access information from a variety of sources including, but not limited to, relational databases, file systems, content management systems and traditional Web sites. OData is consistent with the way the Web works - it makes a deep commitment to URIs for resource identification and commits to an HTTP-based, uniform interface for interacting with those resources (just like the Web). This commitment to core Web principles allows OData to enable a new level of data integration and interoperability across a broad range of clients, servers, services, and tools. OData is released under the Open Specification Promise to allow anyone to freely interoperate with OData implementations."

"The Google Data Protocol is a REST-inspired technology for reading, writing, and modifying information on the web. Many services at Google provide external access to data and functionality through APIs that utilize the Google Data Protocol. The protocol currently supports two primary modes of access: AtomPub: Information is sent as a collection of Atom items, using the standard Atom syndication format to represent data and HTTP to handle communication. The Google Data Protocol extends AtomPub for processing queries, authentication, and batch requests. JSON: Information is sent as JSON objects that mirror the Atom representation."

"This document describes the Google Data Protocol used by many Google APIs, including information about what a query looks like, what results look like, and so on. "