The way that data for each codec is stored in an Ogg container is called its "mapping" into Ogg.
Data for a particular track of content is stored in a single Ogg logical bitstream. The mapping for each codec usually specifies:
- The structure of the beginning-of-stream (BOS) page
- Whether or not the codec uses VorbisComment metadata
- Any other headers
Additional information may be stored in a corresponding OggSkeleton fisbone entry.