Documentation for National Information Exchange Model (NEIM)
Definition Type: Element
Name: realizationEpoch
Namespace: http://niem.gov/niem/external/ogc-gml/3.1.1/dhs-gmo/1.0.0
Type: date:http://www.w3.org/2001/XMLSchema
Containing Schema: gml.xsd
Abstract
Documentation:
The time after which this datum definition is valid. This time may be precise (e.g. 1997.0 for IRTF97) or merely a year (e.g. 1983 for NAD83). In the latter case, the epoch usually refers to the year in which a major recalculation of the geodetic control network, underlying the datum, was executed or initiated. An old datum can remain valid after a new datum is defined. Alternatively, a datum may be superseded by a later datum, in which case the realization epoch for the new datum defines the upper limit for the validity of the superseded datum.
Collapse XSD Schema Diagram:
XSD Diagram of realizationEpoch in schema gml_xsd (National Information Exchange Model (NEIM))
Collapse XSD Schema Code: 
<element name="realizationEpoch" type="date">
    <annotation>
        <documentation>The time after which this datum definition is valid. This time may be precise (e.g. 1997.0 for IRTF97) or merely a year (e.g. 1983 for NAD83). In the latter case, the epoch usually refers to the year in which a major recalculation of the geodetic control network, underlying the datum, was executed or initiated. An old datum can remain valid after a new datum is defined. Alternatively, a datum may be superseded by a later datum, in which case the realization epoch for the new datum defines the upper limit for the validity of the superseded datum. </documentation>
    </annotation>
</element>
Documentation for National Information Exchange Model (NEIM)

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