XML Configuration Access Protocol The XML Configuration Access Protocol is an application layer protocol that allows a client to read, write, and modify application configuration data stored in XML format on a server.Overview XCAP maps XML document sub-trees and element attributes to HTTP URIs, so that these components can be directly accessed by clients using HTTP protocol . An XCAP server is used by XCAP clients to store data like buddy lists and presence policy in combination with a SIP Presence server that supports PUBLISH , SUBSCRIBE and NOTIFY methods to provide a complete SIP SIMPLE server solution.Features The following operations are supported via XCAP protocol in a client-server interaction: Retrieve an item Delete an item Modify an item Add an item The operations above can be executed on the following items: The XCAP addressing mechanism is based on XPath , that provides the ability to navigate around the XML tree .Application usages The following applications are provided by XCAP, by using specific auid : XCAP capabilities. Resource lists. A resource lists application is any application that needs access to a list of resources, identified by a URI , to which operations, such as subscriptions, can be applied. Presence rules . A Presence Rules application is an application which uses authorization policies, also known as authorization rules, to specify what presence information can be given to which watchers, and when. RLS services. A Resource List Server services application is Session Initiation Protocol application whereby a server receives SIP SUBSCRIBE requests for resource, and generates subscriptions towards the resource list. PIDF manipulation. Pidf-manipulation application usage defines how XCAP is used to manipulate the contents of PIDF based presence documents.Standards The XCAP protocol is based on the following IETF standards: RFC4825, RFC4826, RFC4827, RFC5025. Application org.openmobilealliance.pres-rules standard should be added here.
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