Message Format
The push access protocol is independent of the transport used. PAP messages carry control information, and in the case of a push submission, also content and optionally client capabilities information. Control information includes command/response messages between the PPG and the Push Initiator, and parameters passed to the PPG for use in sending content to the wireless device. Examples of this type of information include the wireless device address, the delivery priority of the message, etc. This information is not normally delivered to the wireless device. Content is information that is intended for the wireless device. This information might be intelligible only to the wireless device (e.g. may be encrypted by the Push Initiator or may be application data for an application unknown to the PPG) or it may be recognisable by the PPG (e.g. HTML or WML). The PPG may be configured to perform some transformation on recognisable content (e.g. HTML to WML) for certain wireless devices. The other category of information is client capability information as specified in the User Agent Profile . When more than control is carried in a message, the format of the message is a MIME multipart/related compound object. When only control information (e.g. for message responses) is carried in a message, the format of the message is a simple application/xml entity. All information is transported within a single message body. In the multipart messages, the first entity contains all push related control information in an XML document, the second entity contains the content for the wireless device, the third entity, if present, contains UAPROF client capabilities. The format of the content entity is specified in .
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