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According to ISO 26324, DOI metadata should support the following functions:

•generic mechanism for handling complex metadata for all different types of intellectual property
For example, instead of treating sound carriers, books, videos, and photographs as fundamentally different things with different (if similar) characteristics, they are all recognized as creations with different values of the same higher-level attributes, whose metadata can be supported in a common environment.

•interoperability of metadata across applications, with reference to:

omedia (for example, books, serials, audio, audiovisual, software, abstract works, visual material)

ofunctions (for example, cataloguing, discovery, workflow, and rights management)

olevels of metadata (from simple to complex)

osemantic barriers

olinguistic barriers

•functional granularity, making it possible to identify an object whenever it needs to be distinguished