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Scribble is a simple text based language for describing interactions between multiple parties in the form of a Protocol.
"Scribbling is necessary for architects, either physical or computing, since all great ideas of architectural construction come from that unconscious moment, when you do not realise what it is, when there is no concrete shape, only a whisper which is not a whisper, an image which is not an image, somehow it starts to urge you in your mind, in so small a voice but how persistent it is, at that point you start scribbling" - Kohei Honda 2007
The Protocol notation is intended to provide an abstract description of the communication behaviour, with addtional optional layers being used to describe assertions and other governance related information.
In the world of programming languages, the measure of the simplicity of a language is based on its representation of a simple 'hello world' example. The Scribble Protocol representation of such an example would be:
protocol HelloWorld { participant You, World; Hello from You to World; }
The notation will be explained in more detail in this guide, but basically the protocol is named 'HelloWorld', and describes the communication behaviour between two participants (or parties). A single interaction has been defined, sending a message of type 'Hello' from participant 'You' to participant 'World'.
In the following chapter we will explore the main constructs of the protocol notation. Then we will explore a range of examples, before concluding with a brief overview of some more advanced constructs that are still under development.