Domain Application Protocol
Domain application protocols (DAPs) specify the legal interactions between a consumer and a set of resources involved in a business process. The term DAP is typically used in the context of Representational state transfer (REST).
DAPs sit atop http and narrow http’s broad application protocol to support specific business goals. Services implement Daps by adding hypermedia links to resource representations. these links highlight other resources with which a consumer can interact to make progress through a business transaction. 
- Webber, Parastatidis, Robinson (2010). REST in Practice. O'Reilly. p. 95.
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