The VectorSimpleType is an array of three double values used to represent a 3D vector. The first entry in the list is the X component (I), the second entry is the Y component (J), and the third entry is the Z component (K).
<xs:simpleType name="VectorSimpleType"><xs:annotation><xs:documentation>The VectorSimpleType is an array of three double values used to represent a 3D vector. The first entry in the list is the X component (I), the second entry is the Y component (J), and the third entry is the Z component (K).</xs:documentation></xs:annotation><xs:restriction base="ListDoubleType"><xs:length value="3"/></xs:restriction></xs:simpleType>