dimension (AngleDimension)

b2boptic → items → item → pair → frame → frameBowAngle

values	description
DEG	plane angle
RAD	angular measure
MM	unity is mm

<xs:simpleType name="AngleDimension">
  <xs:restriction base="xs:string">
    <xs:enumeration value="DEG" />
    <xs:enumeration value="RAD" />
    <xs:enumeration value="MM" />
  </xs:restriction>
</xs:simpleType>