Enumerations

Enumerations that are used as parameters in the Messages defined in Services are encoded as xs:string with the following syntax:

<symbol>_<value>

The elements of the syntax are described in Figure 1.

Figure 1: Components of Enumeration

For example, the XML schema for the NodeClass enumeration is:

<xs:simpleType name="NodeClass">
  <xs:restriction base="xs:string">
    <xs:enumeration value="Unspecified_0" />
    <xs:enumeration value="Object_1" />
    <xs:enumeration value="Variable_2" />
    <xs:enumeration value="Method_4" />
    <xs:enumeration value="ObjectType_8" />
    <xs:enumeration value="VariableType_16" />
    <xs:enumeration value="ReferenceType_32" />
    <xs:enumeration value="DataType_64" />
    <xs:enumeration value="View_128" />
  </xs:restriction>
</xs:simpleType>

Enumerations that are stored in a Variant are encoded as an Int32 value.

For example, any Variable could have a value with a DataType of NodeClass. In this case the corresponding numeric value is placed in the Variant (e.g. NodeClass::Object would be stored as a 1).