PREMIS Data Dictionary for Preservation Metadata - version 3.0 Nov. 2015. Official web page

Semantic Units of the PREMIS Data Dictionary

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in the OWL Ontology ver. 1 is defined as:
Class PreservationLevel
ObjectProperty hasPreservationLevel
DatatypeProperty hasPreservationLevelDateAssigned

Containers	Current
1 - Object 1.3 - preservationLevel	1.3.5 preservationLevelDateAssigned

Semantic unit	1.3.5 preservationLevelDateAssigned
Definition	The date, or date and time, when a particular preservationLevelValue was assigned to the object.
Applicability	Intellectual Entity / Representation, File
Obligation	Optional
Repeatability	Not repeatable
Rationale	The preservationLevel applicable to an object is expected to be reviewed and changed over time, in response to changes in repository preservation requirements, policies, or capabilities relevant to the object. The date that the current preservationLevelValue was assigned aids review of decisions.
Data constraint	To aid machine processing, value should use a structured form. To facilitate exchange of PREMIS-conformant metadata, use of standard conventions, for instance as used in the date elements in the PREMIS schema, is recommended.
Examples	2007-11-05 2007-11-05T08:15:30-05:00 20080315 2007-11-05 2007-11-05T08:15:30-05:00 20080315