timeValidityAttributes 

A group of attributes expressing the time period of validity of a relationship

Attribute Group Information

Attributes

QName Type Fixed Default Use Inheritable Annotation
validfrom DateOptTimeType optional 
The date (and, optionally, the time) before which a relationship is not valid.
validto DateOptTimeType optional 
The date (and, optionally, the time) after which a relationship is not valid.

Used By

Elements RelatedConceptType/related, altRep, definition, facet, note
Complex Types ConceptNameType, Flex2ExtPropType, Link1Type, OrganisationLocationType, PersonAffiliationType, RelatedConceptType, RemoteContentPropType, RightsInfoType, SameAsType

Source 

<xs:attributeGroup name="timeValidityAttributes">
  <xs:annotation>
    <xs:documentation>A group of attributes expressing the time period of validity of a relationship</xs:documentation>
  </xs:annotation>
  <xs:attribute name="validfrom" type="DateOptTimeType" use="optional">
    <xs:annotation>
      <xs:documentation>The date (and, optionally, the time) before which a relationship is not valid.</xs:documentation>
    </xs:annotation>
  </xs:attribute>
  <xs:attribute name="validto" type="DateOptTimeType" use="optional">
    <xs:annotation>
      <xs:documentation>The date (and, optionally, the time) after which a relationship is not valid.</xs:documentation>
    </xs:annotation>
  </xs:attribute>
</xs:attributeGroup>