learningResourceType

<xs:group name="learningResourceType">
  <xs:sequence>
    <xs:element name="learningResourceType" type="learningResourceType">
      <xs:unique name="learningResourceTypeUnique">
        <xs:selector xpath="*"/>
        <xs:field xpath="@uniqueElementName"/>
      </xs:unique>
    </xs:element>
  </xs:sequence>
</xs:group>