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Schemes: Dublin Core Pencil.png, Audubon Core Development Pencil.png
Collections: Dublin Core terms namespace Pencil.png, Audubon Core Service Access Point Vocabulary Pencil.png, Audubon Core Layer 2 Pencil.png
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Extent: The size or duration of the resource.

Notes: Audubon Core: The size, dimensions, or duration of the variant of the media resource.

Best practices are: Extent as length/running time should use standard abbreviations of the metadata language (for English "20 s", "54 min"). Extent of images or video may be given as pixel size ("2000 x 1500 px"), or as file size (using kB, kByte, MB, MByte).

Constraints in the context of Dublin Core: