TAILIEUCHUNG - Chapter 17 - Service Configuration on the Internet

Many services require a mechanism for allowing users to manage their service configuration. For example, a presence server requires presentities (users) to authorize which watchers can see their presence information. A Push-to-talk over Cellular (PoC) service requires users to create and manage groups. Likewise a conference may require users to configure a dial-out or dial-in list of participants, their privileges (who can speak or who can send or receive which media type), and so on. | Chapter 17 Service Configuration on the Internet Many services require a mechanism for allowing users to manage their service configuration. For example a presence server requires presentities users to authorize which watchers can see their presence information. A Push-to-talk over Cellular PoC service requires users to create and manage groups. Likewise a conference may require users to configure a dial-out or dial-in list of participants their privileges who can speak or who can send or receive which media type and so on. All of these use cases share many commonalities a user has to perform non-real-time operations on a server to manipulate one or more documents that configure or personalize their instance of the service. Usually the user creates a configuration document locally in their terminal and then uploads it to a server. Sometimes the user just needs to make a small change to an existing document so it is not worth uploading the complete document. Instead it is desireable to have the capability to update part of the document. In some other cases the user changes their usual terminal and uses a different one so they may first need to download a fresh copy of the current configuration document make some changes and upload it either complete or a part of it to the server. Typically configuration documents are highly structured. Owing to this the trend nowadays is to use the Extensible Markup Language XML specified by the World Wide Web Consortium in the W3C recommendation XML 93 for formatting documents that personalize the instance of the service. So we know that configuration documents are effectively XML documents but how are they sent to and received from the server that stores them The XML Configuration Access Protocol XCAP solves this vacuum. The XML Configuration Access Protocol XCAP The problem of document management can be depicted in its most simplified way as in Figure . A user creates an XML document in his computer and wants to .

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