Any type of active code or software program, usually acting according to aBusiness Logic.

An address is used for locating and accessing – “talking to” – a Device, aResource, or a Service. In some cases, the ID and the Address can be the same, but conceptually they are different.

The IoT-A architectural reference model follows the definition of the IoT reference model and combines it with the related IoT reference architecture. Furthermore, it describes the methodology with which the reference model and the reference architecture are derived, including the use of internal and external stakeholder requirements.

The composition of a Physical Entity together with its Virtual Entity.

An association establishes the relation between a service and resource on the one hand and a Physical Entityon the other hand.

Goal or behaviour of a system involving Things serving a particular business purpose. Business Logic can define the behaviour of a single Thing, a group of Things, or a complete business process.

Anything that has the capability to affect a Physical Entity, like changing its state or moving it.

Technical physical component (hardware) with communication capabilities to other IT systems. A device can be either attached to or embedded inside a Physical Entity, or monitor a Physical Entity in its vicinity.

Any computational or data element of an IT-based system.

Discovery is a service to find unknown resources/entities/services based on a rough specification of the desired result. It may be utilized by a human or anotherservice. Credentials for authorization are considered when executing the discovery.