Relations Reference Entity-Relationship ModelingAn entity is any identifiable object (point, device, etc.) that exists independently. A relationship captures how one entity relates to another. For example, in your system you might have an AHU device that supplies air to a specific VAV device. Types of RelationsRelations can be either “direct” or “implied” and are defined as follows:Relation Id StructureA Relation Id contains different parts that, together, make the ID useful as additional information on objects in a station. The following diagram shows the basic parts of a Relation Id.Relation DefinitionsTag Dictionaries often contain a collection of Relation Definitions (shown in the following image) which are standardized Relation Id's with semantic meaning for a given domain or namespace. These relation definitions come into play when adding a relation to a component. In the Relation dialog, your choices are limited to the relations that are defined in the any of the Tag Dictionaries on your system.Relation ManagerThe Relation Manager is an HTML5 view that you can use to add, edit, and delete relations and links (as of Niagara 4.15).Support for RelationsWorkbench support for relations is evident in the Relation Sheet and Wire Sheet views. In either view you are able to create, edit or remove relations. Also, the Spy view includes relations information.