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EFG
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EFG(or EF4G, Esoteric Format for Graphs） is a esoteric markup language or esoteric format invented by User:None1. It can be used for implementing flow-chart-like non-textual esolangs that can't be implemented easily. A program can both be rendered as an image and interpreted by an interpreter.
Format
The format is like this:
<NodeLabel1> <NodeLabel2> <NodeLabel3> ... = <Node11> <Node12> <W1> <Node21> <Node22> <W2> ...
Edges are directed.
A renderer can interpret the node and edge weights freely and that's the essence of this esolang.