Signalling System No 7
While a bit unergonomic to work with, the .7 protocols uses ASN.1 for defining and describing a lot of the protocols and messages.<p>ASN.1 have some nice ideas that the developer community has failed to grok, reverting back to simpler ideas that are more immediately rewarding, such as hand coding a lot of code that blasts away text based messages that may or may not be understandable to the recipients because, hey it works on my machine.<p>The core idea is that there is a language that defines the abstract message content, and there can be several encoders - binary, text, compact binary, depening on needs and computing and bandwidth requirements.<p>There are also some support for defining the criticality of any extensions to a protocol, to inform recipients if the can disregard an additional part it does not understand or if it&#x27;s critical.<p>This is not an afterthough as json schema, but the core idea.