3.5. Resources over Time
Problems of âwhat is the resource?â and âhow do we identify it?â are complex and often require ongoing work to ensure they are properly answered as the content and context of an organizing system evolves. As a result, we might need to know how a resource does or does not change over time (its persistence), whether its state and content come into play at a specified point in time (its effectivity), whether the resource is what it is said to be (its authenticity), and sometimes who has certified its authenticity over time (its provenance).
![A conceptual drawing of maintenance considerations. Persistence is presented as a timeline that is labeled from 1998 until 2013; provenance is presented as an unbroken chain; authenticity is questioned in 1991; and effectivity periods are indicated from 1990-1996 and 2000-2013. Changes of possession are indicated in 1995, 2005, and 2009. A conceptual drawing of maintenance considerations. Persistence is presented as a timeline that is labeled from 1998 until 2013; provenance is presented as an unbroken chain; authenticity is questioned in 1991; and effectivity periods are indicated from 1990-1996 and 2000-2013. Changes of possession are indicated in 1995, 2005, and 2009.](/api/v2/epubs/9781491938737/files/figs/Figure-3.6.jpg)
Four considerations that arise with respect to the maintenance of resources over time are their persistence, provenance, authenticity, and effectivity.
3.5.1. Persistence
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