<xs:attributeGroup name="VersionHandlingEffectiveDateOptional">
<xs:annotation>
<xs:documentation xml:lang="en-US">Used to define version handling attributes, effective date is optional here</xs:documentation>
</xs:annotation>
<xs:attribute ref="effectiveDate" use="optional"/>
<xs:attribute ref="expirationDate" use="optional"/>
<xs:attribute ref="officialReleaseDate" use="optional"/>
<xs:attribute ref="lastModifiedDate" use="optional">
<xs:annotation>
<xs:documentation xml:lang="en-US">Identifies last point in time that the object was changed. While any versionable object could principally be marked using this attribute, the list of objects that need this in practice is scoped to be dataset, scenario, transaction, valueSet, codeSystem, template. This list may be extended over time.</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute ref="versionLabel" use="optional"/>
</xs:attributeGroup>
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