4. The method according to claim 1 , wherein the access permission information comprises an identity identifier, an action field and an operation type field; and the process of determining whether to perform an operation described in the XML document management operation request in accordance with access permission information corresponding to an XML document comprises: determining whether to perform the operation requested by the XDMC in accordance with the action field and the operation type field corresponding to the identity identifier of the XDMC sending the XML document management operation request, wherein the action field and the operation type field are obtained from the access permission information.
4. The method according to claim 1 , wherein the access permission information comprises an identity identifier, an action field and an operation type field; and the process of determining whether to perform an operation described in the XML document management operation request in accordance with access permission information corresponding to an XML document comprises: determining whether to perform the operation requested by the XDMC in accordance with the action field and the operation type field corresponding to the identity identifier of the XDMC sending the XML document management operation request, wherein the action field and the operation type field are obtained from the access permission information. 5. The method according to claim 4 , wherein the action field corresponding to each identity identifier in the access permission information comprises at least one of allowing, denial and required confirmation; the operation type field corresponding to each identity identifier comprises at least one of: a read operation, a creation operation, a modification operation, a deletion operation, a search operation, a suspense operation, a recovery operation and a subscription operation.