Introduction to Pro Tools : Pro Tools Concepts : AAF, MXF, and OMF : Metadata

Metadata
Metadata is used to describe the following:
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Information embedded in a media file. This may include scene, take, sample rate, bit depth, external clip names, the name of the videotape from which the media file was captured, and even timecode values.
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Information embedded in Pro Tools sessions or other sequences, including what files are used, where they appear in a timeline, and automation.
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For AAF or OMF sequences, metadata also includes information embedded in unrendered AudioSuiteā„¢ effects (such as real-time EQ) on Avid workstations. Pro Tools skips unrendered effects on import. Rendered effects are media files that can be imported into Pro Tools.
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For AAF or OMF sequences, information about automation (clip-based gain or keyframe gain).