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Metadata

Metadata provides information about some other, primary, data. It is data about data. For example there may be a primary file containing a song and a separate metadata file containing the name of the song, the name of the primary file, a URL to download the primary file, and lyrics. In the context of P2P, metadata usually comes up for one of two reasons:

  1. it tends to be smaller and thus easier to move than primary data, and
  2. undirected routing uses functional descriptions of resources rather than network addresses - functional descriptions and metadata are closely related.

The Dublin Core project is developing standardized metadata formats.

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