Blockly
Wolfgang Fahl
https://developers.google.com/blockly/guides/create-custom-blocks/define-blocks
https://developers.google.com/blockly/publications/papers/TipsForCreatingABlockLanguage.pdf
Examples
BlocksCAD
http://platenspeler.github.io/DeveloperGuide/Rules_Manual/index.html
Examples
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BlocksCAD
http://platenspeler.github.io/DeveloperGuide/Rules_Manual/index.html
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