这些图叫什么？ （答案：铁路图）
我在一些帮助文件和src文档中看到过很多这样的图，
它们叫什么？还有其他（出于相同目的）已知的图表吗？
I have seen a lot of these diagrams in some help files and src documentation
What are they called? Are there any other (for same purpose) known diagrams?
Img source : http://www.sqlite.org/images/syntax/insert-stmt.gif
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它们被称为“铁路图”，因为它们类似于铁轨。在更正式的语法被广泛使用之前，它们经常被用来描述旧语言的语法。它们的问题是您无法轻松地将它们输入到解析器生成器或语法检查器等工具中，因此现在它们的使用不多。
They are called "railroad diagrams", because of their resemblance to a railroad track. They were often used to describe the grammar of older languages, before more formal grammars became routinely used. The problem with them is you can't easily feed them into tools like parser generators, or grammar checkers, so they are not used so much these days.
它们被称为语法图。
They are called syntax diagrams.