Methods and apparatus to subscribe for change notifications in a document management system

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A method performed at a subscription proxy to notify a principal of a change to an extensible markup language (XML) document, the method comprising:

• receiving a session initiation protocol (SIP) NOTIFY message indicating a change to an XML document;
• and
• sending, to an XML document management client (XDMC) used by the principal, a push message to forward a notification regarding the change, the push message being at least partially based on first information extracted from the SIP NOTIFY message and stored second information which was previously extracted from an XML document command protocol (XDCP) request previously received from the XDMC for initiating a subscription to notifications regarding changes to the XML document.

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A method performed at an extensible markup language (XML) document management client (XDMC) to receive notifications of changes to an XML document, the method comprising:

• sending an XML document command protocol (XDCP) request to a subscription proxy to generate a subscription to notifications regarding changes to the XML document, the XML document being managed by an XML document management server (XDMS) communicatively coupled with the subscription proxy;
• and
• receiving a notification, based on the subscription, of a change to the XML document from a push proxy gateway in communication with the subscription proxy.

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