Graham Moore details the choices made to make the Web3 platform follow “many” of the principles of REST.
While you are there, watch Web3 Platform Getting Started No 1. Good presentation.
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Additional resources:
Tutorial on REST: Learn REST: A Tutorial
Fielding, Roy T.; Taylor, Richard N., Principled Design of the Modern Web Architecture
Fielding, Roy Thomas (dissertation), Architectural Styles and the Design of Network-based Software Architectures
Update:
See also: Restful Interface to Topic Maps Another REST interface effort.