However, the validator does require some additional metadata to be added to the syntax information and imposes some restrictions in its structure.

但是，验证器的确需要向这个语法信息添加一些额外的元数据并对其结构实施一些限制。

youdao

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

定义语言就是定义它的抽象句法树，它的抽象文法。

youdao

The structure of GCC syntax tree and its functions in compiling are introduced.

介绍了GCC抽象语法树的结构及在编译过程中的作用。

youdao