3.2.5.2.2.2 Sending a Query Device Namespace Response

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The client responds with the QUERY_DEV_NS_RSP reply message after retrieving the DefaultNamespace from the printer driver. If the driver returns NULL for default namespace, the is_null_flag field MUST be set to TRUE (0x01) and the DefaultNamespace field MUST be omitted. Otherwise, the is_null_flag field MUST be set to FALSE (0x00) and the DefaultNamespace field MUST contain the string returned by the driver. The DefaultNamespace value has meaning only within the printer driver context and is not interpreted by the Printer Ticket Interface. The return result of the call MUST be sent in the Result field of the response.