抽象句法和混合句法规范标准。

Compliance to both abstract and concrete syntax.

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定义语言就是定义它的抽象句法树，它的抽象文法。

You define a language by defining the structure of its abstract syntax tree, its abstract grammar.

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MPS用一棵抽象句法树（ AST）来维护代码。

MPS maintains the code in an Abstract Syntax Tree ( AST), which consists of nodes with properties, children and references, and fully describes the program code.

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