<simpleType name="PolymerTypeEnumType">
  <restriction base="string">
    <enumeration value="hdpe">
      <annotation>
        <documentation>High-density polyethylene.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="pet">
      <annotation>
        <documentation>Polyester (polyethylene terephthalate).</documentation>
      </annotation>
    </enumeration>
    <enumeration value="pp">
      <annotation>
        <documentation>Polypropylene.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="pva">
      <annotation>
        <documentation>Polyvinyl alcohol.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="pa">
      <annotation>
        <documentation>Polyamide (nylon).</documentation>
      </annotation>
    </enumeration>
    <enumeration value="aramid">
      <annotation>
        <documentation>Aramid (aromatic polyamide) fiber.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="basalt">
      <annotation>
        <documentation>Basalt fiber.</documentation>
      </annotation>
    </enumeration>
  </restriction>
</simpleType>