Digital Item Identification
Digital Item Identification (DII) specification includes not only how to identify Digital Items uniquely but also to distinguish different types of them. These Identifiers are placed in a specific part of the Digital Item Declaration, which is the statement element, and they are associated with Digital Items.
Digital Items and their parts are identified by encapsulating uniform resource identifiers, which are a compact string of characters for identifying an abstract or physical resource.
The elements of a DID can have zero, one or more descriptors; each descriptor may contain a statement which can contain an identifier relating to the parent element of the statement. Besides the references to the resources, a DID can include information about the item or its parts. On the left, there's a visual example about the metadata that a music album could have in MPEG-21.
It is necessary for DII to allow differentiating between the different schemas that users can use to describe their content. MPEG-21 DII uses the XML mechanism to do this.
Read more about this topic: Digital Item
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