The C2 architectural style is primarily concerned with high-level system composition issues, rather than particular component packaging approaches [3,5]. The building blocks of C2 architectures are components (computational elements) and connectors (interconnection and communication elements). This separation of computation from communication enables the construction of flexible, extensible, and scalable systems that can evolve both before and during runtime. This style places no restrictions on the implementation language or granularity of components and connectors, potentially allowing it to use multiple interoperability technologies for its connectors.
See: http://sunset.usc.edu/~neno/teaching/s99/NR98.pdf
It is also interesting to see C2 and REST presented as alternative architectural styles. I really like the idea of architectural description languages that are constraint based. Section 2.3 of the Web Services Architecture document is wonderful. Oddly, the other portions are out of place.
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