notBefore-iso 

specifies the earliest possible date for the event in standard form, e.g.
yyyy-mm-dd.

Attribute Information

Used By

Attribute Group tei:att.datable.iso.attribute.notBefore-iso

Source 

<xs:attribute name="notBefore-iso">
  <xs:annotation>
    <xs:documentation>specifies the earliest possible date for the event in standard form, e.g. yyyy-mm-dd.</xs:documentation>
  </xs:annotation>
  <xs:simpleType>
    <xs:union memberTypes="xs:date xs:gYear xs:gMonth xs:gDay xs:gYearMonth xs:gMonthDay xs:time xs:dateTime">
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:pattern value="[0-9.,DHMPRSTWYZ/:+\-]+"/>
        </xs:restriction>
      </xs:simpleType>
    </xs:union>
  </xs:simpleType>
</xs:attribute>

Sample