IdentifierPeriod

IdentifierPeriod says when an Identifier applies: the number the part carries now, the one it carried before, or the one it will carry next. Drawings commonly print a former number beside the current one, and treating the two as interchangeable is how a revision gets filed against the wrong record.

Use it to keep a superseded number searchable without letting it overwrite the current one, and to follow a part across a renumbering. Like the stakeholder, the field is optional and is populated only where the drawing states the period, so absence means "not stated" rather than "current".

 996
 997
 998
 999
1000
1001
1002
1003
1004
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1007
1008
1009

class IdentifierPeriod(str, Enum):
    """
    Enum representing the period of an identifier.

    Attributes:
    ----------
    - PREVIOUS: Refers to a past period or version of the identifier.
    - CURRENT: Refers to the present or active period of the identifier.
    - FUTURE: Refers to a future or planned version of the identifier.
    """

    PREVIOUS = "PREVIOUS"  # Past period or version
    CURRENT = "CURRENT"  # Present or active period
    FUTURE = "FUTURE"  # Future or planned version