material (FrameMaterials)

b2boptic → items → item → pair → frame

values	description
METAL	metal frame
PLASTIC	plastic frame
OPTYL	optyl frame
NYLOR	nylor frame
DRILLED	frame with drilled holes
SPECIAL	all other frame types

<xs:simpleType name="FrameMaterials">
  <xs:restriction base="xs:string">
    <xs:enumeration value="METAL" />
    <xs:enumeration value="PLASTIC" />
    <xs:enumeration value="OPTYL" />
    <xs:enumeration value="NYLOR" />
    <xs:enumeration value="DRILLED" />
    <xs:enumeration value="SPECIAL" />
  </xs:restriction>
</xs:simpleType>