What is a REBOL struct! datatype?

What is a struct! datatype in REBOL and how do开发者_StackOverflow中文版es it work?

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In rebol, struct! is a data type used to approximate struct in the C languages. It also is used in argument specification. A good description of what it is and how to use it is at:

http://www.rebol.com/docs/library.html#struct