what kind of language is used in the property expressions? It's near by excel, but it's in many point not excel.
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It has actually LISP syntax. I don't think this is specific language been used. Probably created especially for that function. Strange that there GDL was not been used.
It's just an expression with common-sense operator precedence. There are no loops or variables which would make it a language technically.
Here is some help: https://community.Graphisoft.com/t5/Document-articles/Expression-based-properties-FAQ/ta-p/303797