Patent ID: 8549040

Claim:
A method of operating an XML Document Management Server provided within an IP Multimedia Subsystem, the method comprising: receiving a message from a user terminal requesting an XML document, the XML document conforming to a given structure defined by an XML schema and containing one or more service rules relating to a service; retrieving the XML document containing said service rules from a data storage entity; if the structure of the retrieved XML document differs from said given structure, adapting a rule or rules of the retrieved XML document such that the XML document conforms to said given structure; sending the adapted XML document to the user terminal; prior to receiving said message requesting an XML document: receiving a message from the user terminal requesting a list of the XML documents available for the service; sending a message to the user terminal including a list of XML documents that the XML Document Management Server can provide for said service, the XML documents in the list presenting said service rules in respective different structures; and receiving another message from the user terminal which includes a URI of an XML document selected from the list, the URI being used to determine the schema.