<complexType name="ConstituentPropertyType">
  <sequence>
    <element maxOccurs="1" minOccurs="1" ref="diggs:Constituent">
      <annotation>
        <documentation>A name (codeValue) that identifies a constituent within the extent of the described lithology (required) and optional description, along with a description of the abundance and distribution of this constituent (if applicable) within the lithologic extent described.</documentation>
      </annotation>
    </element>
  </sequence>
</complexType>