<xs:simpleType name="EffectiveStartDateContextCodeType">
  <xs:annotation>
    <xs:documentation>GS1 classifier modified based on PDS: defines an associated event which gives meaning to the effective start date for a segment.</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:NMTOKEN">
    <xs:pattern value="AD_START_DATE"/>
    <!-- The start date for an advertisement for a given product. -->
    <xs:pattern value="FIRST_DELIVERY_DATE"/>
    <!-- The day on which the first delivery is made. Also know as First Arrival Date. -->
    <xs:pattern value="FIRST_ORDER_DATE"/>
    <!-- It indicates the earliest date that an order can be placed for the trade item. -->
    <xs:pattern value="FIRST_SHIP_DATE"/>
    <!-- It indicates the earliest date that the trade item can be shipped. This is independent of any specific ship-from location. -->
    <xs:pattern value="VALIDITY_START_DATE"/>
    <!-- It indicates the date from which the information (e.g. ItemPriceType) is valid. The element is added based on PDS for mapping PDS tradeItemPriceBegin to eDocument -->
  </xs:restriction>
</xs:simpleType>