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Which software is used to draw these (recursive processing) graphs?

Example at json.org: JSON number

Example at sqlite.org: SQLite table-constraint

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What's recursive about them? – martineau Aug 1 '12 at 23:53
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In what way is this off-topic while the questions about generating other types of graphics are acceptable? – James M. Aug 2 '12 at 0:50
@martineau They are (in this case) graphs about how to read these constructs using recursive processing (instead of regular expressions). – Camilo Martin Aug 2 '12 at 0:59
I'm also curious why it got closed as off-topic... I'm just asking how can I make this graph. – Camilo Martin Aug 2 '12 at 0:59
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There's essentially an identical non-closed SU question (and a similar, but more elaborate answer) here. – martineau Aug 2 '12 at 11:40
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closed as off topic by random♦ Aug 2 '12 at 0:11

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1 Answer

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There's an online generator here. The Wikipedia article on railroard diagrams (aka syntax digrams) where I found it also has some other references which might be helpful.

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Thanks, I didn't even knew that was the name :) Still, I wonder why my question got downvoted and closed... – Camilo Martin Aug 2 '12 at 1:02
Don't know @Camilo, seems like a perfectly reasonable question to me. Anyway, now that you know the common names for this sort of diagram, you should be able to continue your search for tools to generate them. I don't think whether the grammar is recursive or not matters. – martineau Aug 2 '12 at 1:42
Yes, thanks again! – Camilo Martin Aug 2 '12 at 1:59

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