7.1.6 UA Reference
| Equivalent WoT TD definition | Additional semantic annotations at property and action level |
| Description | A reference in OPC UA is used to define the relationship between two nodes. OPC UA defines several hierarchical and non-hierarchical references. In this specification version, a minimal set of references (e.g., HasComponent, HasTypeDefinition) can be used in a TD to represent the relationship between interaction affordances or between a Thing and its interaction affordances. Some references are defined by own terms (e.g., uav:componentOf") or can be part of @types definitions. Details about the reference types that are mapped within a TD are provided in Section 7.3. |
| Snippet example in OPC UA (e.g., as nodeset) | … <References> <Reference ReferenceType="HasComponent" IsForward="false">ns=3;i=5001</Reference> </UAVariable> |
| Transformed usage in a TD definition (as snippet) | "properties": { "3:ActualPosition": { |