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Looking at the images under Syntax here.

enter image description here

It shows the syntax (grammar) in a visual way. Is there specialized software for creating and editing such diagrams?

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See Tool for generating railroad diagram on StackOverflow.

There is an online railroad diagram generator which generates SVG diagrams from EBNF

example railroad diagram

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Some web searching for "syntax diagram generator" (and similar phrases) got me this: http://karmin.ch/ebnf/index

I've never used it but it looks like it will generate syntax diagrams. They won't look 100% like Oracle's but they should still be usable. I don't know what tool Oracles, uses. Probably some internal tool that they don't distribute.

Here's another one:

http://dotnet.jku.at/applications/Visualizer/

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