6. A system for managing printing of an eXtensible Markup Language (XML) document, comprising: a policy agent, included in a printing apparatus, for requesting a policy object defining a printing layout and an access authority to output data, to a policy management server, upon receiving a request from a user to print an XML document; a policy management server for transmitting the policy object to the policy agent in response to the request, wherein the policy object is located using reference information contained in the XML document for identifying the location of the policy object; and a policy repository for storing the policy object; wherein the policy agent receives the policy object from the policy management server, interprets the policy object, obtains policy information, and determines whether the user requesting to print the XML document has an access authority to the XML document on the basis of the policy information, and if it is determined that the user has the access authority, the XML document is printed according to the policy information, wherein the policy information represents interpretation information for an XML tag.
6. A system for managing printing of an eXtensible Markup Language (XML) document, comprising: a policy agent, included in a printing apparatus, for requesting a policy object defining a printing layout and an access authority to output data, to a policy management server, upon receiving a request from a user to print an XML document; a policy management server for transmitting the policy object to the policy agent in response to the request, wherein the policy object is located using reference information contained in the XML document for identifying the location of the policy object; and a policy repository for storing the policy object; wherein the policy agent receives the policy object from the policy management server, interprets the policy object, obtains policy information, and determines whether the user requesting to print the XML document has an access authority to the XML document on the basis of the policy information, and if it is determined that the user has the access authority, the XML document is printed according to the policy information, wherein the policy information represents interpretation information for an XML tag. 7. The system of claim 6 , wherein the policy management server requests the policy object requested from the policy agent to the policy repository, and the policy repository searches for the policy object requested from the policy management server and transmits the searched policy object to the policy management server.