<xs:simpleType name="spiralGeometryType">
  <xs:annotation>
    <xs:documentation>The type of the Spiral (can be biquadratic, bloss, clothoid, cosine, cubic, sinusoid, reverse biquadratic, reverse bloss, reverse cosine or reverse sinusoid)</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:NMTOKEN">
    <xs:enumeration value="biquadratic"/>
    <xs:enumeration value="bloss"/>
    <xs:enumeration value="clothoid"/>
    <xs:enumeration value="cosine"/>
    <xs:enumeration value="cubic"/>
    <xs:enumeration value="sinusoid"/>
    <xs:enumeration value="rev_biquadratic"/>
    <xs:enumeration value="rev_bloss"/>
    <xs:enumeration value="rev_cosine"/>
    <xs:enumeration value="rev_sinusoid"/>
  </xs:restriction>
</xs:simpleType>