| 摘要 |
Techniques for communicating metadata are disclosed. According to one technique, a device comprises a configuration module. The configuration module contains and specifies a mapping table. For example, each mapping in the mapping table might indicate a standard, a retrieving protocol, and a packaging protocol. In the mapping table, a particular retrieving or packaging protocol can be mapped to more than one standard. The device comprises one or more separately implemented retrieving protocol modules and packaging protocol modules. The device receives a client's request. The device selects a retrieving protocol to interpret the request, and interprets the request using that protocol. The device uses the mapping table to determine a packaging protocol that is mapped to the client's standard. The device uses the selected packaging protocol to package, in the appropriate form, the requested metadata. The device sends the appropriately packaged metadata back to the client.
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