19. The document management method according to claim 18 , wherein in the document call request accepting step, as the request of the method, a request for a property of the desired node specified by the document ID is accepted, and wherein in the returning step, when the request for the property of the desired node specified by the document ID has been accepted in the document call request accepting step, the property of the desired node specified by the document ID is returned to the client apparatus making the document call request.
18. The document management method according to claim 17 , wherein in the document call request accepting step, together with the document ID, a request of a method that designates information to be returned to the client apparatus is accepted, and wherein in the returning step, when the connection to the desired node specified by the document ID has been made in the connections making step, the information designated by the method is returned to the client apparatus making the document call request.