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XML, RDF, and CC/PP Extensible Markup Language (XML) describes a class of data objects called XML documents and partially describes the behavior of the computer programs that process them. XML is an application profile or restricted form of the Standard Generalized Markup Language (SGML). Resource Description Framework (RDF) can be used to create a general, yet extensible framework for describing user preferences and device capabilities. This information can be provided by the user to servers and content providers. The servers can use this information describing the user’s preferences to customize the service or content provided | Mobile Telecommunications Protocols For Data Networks. Anna Hac Copyright 2003 John Wiley Sons Ltd. ISBN 0-470-85056-6 7 XML RDF and CC PP Extensible Markup Language XML describes a class of data objects called XML documents and partially describes the behavior of the computer programs that process them. XML is an application profile or restricted form of the Standard Generalized Markup Language SGML . Resource Description Framework RDF can be used to create a general yet extensible framework for describing user preferences and device capabilities. This information can be provided by the user to servers and content providers. The servers can use this information describing the user s preferences to customize the service or content provided. The ability of RDF to reference profile information via URLs assists in minimizing the number of network transactions required to adapt content to a device while the framework fits well into the current and future protocols. A Composite Capability Preference Profile CC PP is a collection of the capabilities and preferences associated with user and the agents used by the user to access the World Wide Web. These user agents include the hardware platform system software and applications used by the user. User agent capabilities and references can be thought of as metadata or properties and descriptions of the user agent hardware and software. XML DOCUMENT XML documents are made up of storage units called entities which contain either parsed or unparsed data. Parsed data is made up of characters some of which form character data and some of which form markup. Markup encodes a description of the document s storage layout and logical structure. XML provides a mechanism to impose constraints on the storage layout and logical structure. A software module called an XML processor is used to read XML documents and provide access to their content and structure. It is assumed that an XML processor is doing its work on behalf of another .

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