Information Model developers define standard AddressSpaces which are implemented by many Servers. There is a need for a standard syntax that Information Model developers can use to formally define their models in a form that can be read by a computer program. This Annex defines an XML-based schema for this purpose.
The XML Schema released with this version of the standards can be found here:
NOTE The latest file that is compatible with this version of the standards can be found here:
The schema document is the formal definition. The description in this Annex only discusses details of the semantics that cannot be captured in the schema document. Types which are self-describing are not discussed.
This schema can also be used to serialize (i.e. import or export) an arbitrary set of Nodes in the Server Address Space. This serialized form can be used to save Server state for use by the Server later or to exchange with other applications (e.g. to support offline configuration by a Client).
This schema only defines a way to represent the structure of Nodes. It is not intended to represent the numerous semantic rules which are defined in other parts of this specification. Consumers of data serialized with this schema need to handle inputs that conform to the schema, however, do not conform to the OPC UA specification because of one or more semantic rule violations.
The tables defining the DataTypes in the specification have field names starting with a lowercase letter. The first letter shall be converted to upper case when the field names are formally defined in a UANodeSet.