Show me your flowchart and conceal your tables, and I shall continue to be mystified. Show me your tables, and I won't usually need your flowchart; it'll be obvious." -- Fred Brooks, The Mythical Man Month (1975)
The semantics are DMN.
The syntax is Markdown.
(Hence the name; apologies to any aibohphobes.)
The input is plain-text.
The output is JS. (And, in future, XML, Python, English, LegalRuleML...)
The interface is CLI. No mouse needed!