A technology interface specifies how the technology services of a node can be accessed by other nodes. A technology interface exposes a technology service to the environment. The same service may be exposed through different interfaces.
In a sense, a technology interface specifies a kind of contract that a component realizing this interface must fulfill. This may include, for example, parameters, protocols used, pre- and post conditions, and data formats.
A technology interface may be part of a node through composition (not shown in the standard notation), which means that these interfaces are provided by that node, and can serve other nodes. A technology interface can be assigned to a technology service, to expose that service to the environment.
The name of a technology interface should preferably be a noun.