我在 JSON 规范中找到了这个图：
（来源：json.org）
这个图表约定来自哪里从？难道这只是DC随意炮制的惯例吗？
I found this diagram in the JSON specification:
(source: json.org)
Where does this diagramming convention come from? Is it just some random convention cooked up by D.C.?
这就是所谓的铁路图。请参阅维基百科文章了解更多信息。
That's called a railroad diagram. Have a look at the wikipedia article for more information.
该图称为语法图或铁路图。它用于直观地表示上下文无关语法。它是扩展巴科斯-瑙尔范式的图形描述，也用于表示上下文无关语法。
That diagram is known as a syntax diagram or railroad diagram. It's used to visually represent context-free grammars. It's a graphical depiction of the Extended Backus-Naur Form, which is also used to represent context-free grammars.
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这就是所谓的铁路图。请参阅维基百科文章了解更多信息。
That's called a railroad diagram. Have a look at the wikipedia article for more information.
该图称为语法图或铁路图。它用于直观地表示上下文无关语法。它是扩展巴科斯-瑙尔范式的图形描述，也用于表示上下文无关语法。
That diagram is known as a syntax diagram or railroad diagram. It's used to visually represent context-free grammars. It's a graphical depiction of the Extended Backus-Naur Form, which is also used to represent context-free grammars.