| #### Backing Store Data The backing store interface provides for the tagged storage and retrieval of typed data. The tag (or retrieval key) can be either a UUID or a standard C string. For a specific backing store, the data type must be specified at compile time, and is established through the IDL Encoding Services. Each backing store can contain only a single data type. Each data item (also called a data object or data record) consists of the data stored by a single call to a storage routine (dce_db_store( ), dce_db_store_by_name( ), or dce_db_store_by_uuid( )). Optionally, data items can have headers. If a backing store has been created to use headers, then every data item must have a header. For a description of the data item header, see Data Types and Structures, below. ####