A more significant advantage of metadata is the ability for a compiler to use it to perform some basic compile-time checking.
元数据更重要的优点是编译器可以使用它来执行基本的编译时检查。
Metadata can be used to create documentation, to track down dependencies in code, and even to perform rudimentary compile-time checking.
元数据可以用于创建文档，跟踪代码中的依赖性，甚至执行基本编译时检查。
SQLJ can perform syntactic and semantic checking on the code, using database connections at compile time.
SQLJ可以通过在编译时使用数据库连接，对代码执行语法和语义上的检查。
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