Metadata enables language interoperability by defining a uniformmechanism for storing and retrieving information about types.
中继资料是藉由定义储存和撷取型别资讯的统一机制,来达成语言互通性。
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URL a Uniform resource Locator (URL) is an identifier that specifies where an identified resource is available and the mechanism for retrieving it such as the address of a web page.