<xs:element name="MechanicalMaterialCharacteristics">
<xs:complexType>
<xs:sequence>
<xs:element ref="MechanicalMaterialDescription" />
<xs:choice minOccurs="0">
<xs:element ref="WireMaterial" />
<xs:element ref="PlasticMaterial" />
</xs:choice>
<xs:element ref="ColourCode" minOccurs="0" />
<xs:element ref="ColourDescription" minOccurs="0" />
</xs:sequence>
</xs:complexType>
</xs:element>
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