目前来讲，规范并没有明确说明该如何描述数据图。
Right now, the specification is not clear about how a Data Graph must be described.
元数据是描述产品模型和接口规范最好的工具。
Metadata is the best tool to describe the product model and interface specification.
元数据是描述产品模型和接口规范最好的工具。
Metadata is the best tool to describe the product model and interface specification.
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