The where question leads us to the location in which a specific implementation can be accessed. A unit of data being communicated. Messages can have any number of parts, and each part is associated with a type. The specific implementation of an abstract specification is defined via a binding, which specifies in detail how the abstract information is mapped to a specific representation in a given protocol. Bindings are comprehensive since they encompass ports, operations, and messages.
Bindings also specify how types are represented on the wire.
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