<datasets>
  <dataset canonicalUri="" effectiveDate="" expirationDate="" id="" iddisplay="" ident="" lastModifiedDate="" officialReleaseDate="" prefix="" referencedFrom="" shortName="" statusCode="" url="" versionLabel="">{0,unbounded}</dataset>
</datasets>

<xs:element name="datasets">
  <xs:complexType>
    <xs:sequence>
      <xs:element ref="dataset" minOccurs="0" maxOccurs="unbounded"/>
    </xs:sequence>
  </xs:complexType>
  <xs:unique name="dataset-idversion-unique">
    <xs:selector xpath="dataset"/>
    <xs:field xpath="@id"/>
    <xs:field xpath="@effectiveDate"/>
  </xs:unique>
  <xs:unique name="concept-idversion-unique">
    <xs:selector xpath=".//concept"/>
    <xs:field xpath="@id"/>
    <xs:field xpath="@effectiveDate"/>
  </xs:unique>
  <!-- Tempting, but does not fly for compilations -->
  <!--<xs:unique name="conceptlist-id-unique">
            <xs:selector xpath=".//conceptList"/>
            <xs:field xpath="@id"/>
            <xs:field xpath="@effectiveDate"/>
        </xs:unique>-->
  <!--<xs:unique name="conceptlistconcept-id-unique">
            <xs:selector xpath=".//conceptList/concept"/>
            <xs:field xpath="@id"/>
        </xs:unique>-->
</xs:element>