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Subject: W3C Provenance Working Group announces 3 Last Call Working Drafts
For many purposes, a key consideration for deciding whether something is reliable and/or trustworthy is knowing who or what was reponsible for its production. Data published by a respected independent organization may be considered more trustworthy than that from a lobby organization; a claim by a well-known scientist with an established track record may be more believed than a claim by a new student; a calculation performed by an established software library may be more reliable than by a one-off program.
An agent is something that bears some form of responsibility for an activity taking place, for the existence of an entity, or for another agent's activity
A bundle is a named set of provenance descriptions, and is itself an entity, so allowing provenance of provenance to be expressed.
For users to decide whether they can place their trust in something, they may want to analyze its provenance, but also determine the agent its provenance is attributed to, and when it was generated. In other words, users need to be able to determine the provenance of provenance. Hence, provenance is also regarded as an entity (of type Bundle), by which provenance of provenance can then be expressed.