Element: ext:preservation-committment-level
Preservation level promised by the publisher or archive. The preservation level can be different for each format type, and different for each object within a format. There is no established list of types or values at this time. Each publisher or archive must establish what they mean by level of preservation. For example, the US National Library of Medicine uses what they call "permanence levels:"
* Permanent: Unchanging Content
* Permanent: Stable Content
* Permanent: Dynamic Content
* Permanence Not Guaranteed
See: http://www.nlm.nih.gov/psd/pcm/devpermanence.html
Content Model
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