ExpandedNodeId values shall be encoded as a JSON object with the fields defined in Table 32.
The abstract ExpandedNodeId structure is defined in OPC 10000-4 and has five fields Identifier, IdentifierType, NamespaceIndex, NamespaceUri and ServerIndex. The representation of these abstract fields are described in the table.
Table 32 – JSON Object Definition for an ExpandedNodeId
|
Name |
Description |
|
IdType |
The IdentifierType encoded as a JSON number. Allowed values are: 0 - UInt32 Identifier encoded as a JSON number. 1 - A String Identifier encoded as a JSON string. 2 - A Guid Identifier encoded as described in 5.4.2.7. 3 - A ByteString Identifier encoded as described in 5.4.2.8. This field is omitted for UInt32 identifiers. |
|
Id |
The Identifier. The value of the IdType field specifies the encoding of this field. |
|
Namespace |
For reversible encoding this field is a JSON string with the NamespaceUri if the NamespaceUri is specified. Otherwise, it is a JSON number with the NamespaceIndex. The field is omitted if the NamespaceIndex is 0. For non-reversible encoding this field is the JSON string containing the NamespaceUri or the NamespaceUri associated with the NamespaceIndex unless the NamespaceIndex is 0 or 1. If the NamespaceIndex is 0 the field is omitted. |
|
ServerUri |
For reversible encoding this field is a JSON number with the ServerIndex. The field is omitted if the ServerIndex is 0. For non-reversible encoding this field is the JSON string containing the ServerUri associated with the ServerIndex unless the ServerIndex is 0. If the ServerIndex is 0 the field is omitted. |