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Amazon Elastic Compute Cloud Developer Guide API Conventions API Reference Amazon EC2 provides two APIs, SOAP and Query. These APIs allow developers to launch and control instances from their own applications. This section discusses the operations available in the Amazon EC2 APIs, the semantics of those calls and the parameters that must be supplied. Examples of requests and responses are also provided. Note The same XML body is returned in both the Query API and SOAP API. We recommend you familiarize yourself with the conventions we've used in describing the API. API Conventions Overview This topic discusses the conventions used in the Amazon EC2 API reference. This includes terminology, notation and any abbreviations used to illuminate the API. The API reference is broken down into a collection of Actions and Data Types. Actions Actions encapsulate the possible interactions with Amazon EC2. These can be viewed as remote procedure calls and consist of a request and response message pair. Requests must be signed, allowing Amazon EC2 to authenticate the caller. For clarity, the sample requests and responses illustrating each of the operations described in this reference are not signed. Data Types and the Amazon EC2 WSDL The current version of the Amazon EC2 WSDL is available at the following location: http://ec2.amazonaws.com/doc/2007-03-01/AmazonEC2.wsdl. Some libraries can generate code directly from the WSDL. Other libraries require a little more work on your part. Values provided as parameters to the various operations must be of the indicated type. Standard XSD API Version 2007-03-01 43