元数据类型是特定内容类型与基础类型聚合的类型，提供特定于某类内容的特定属性。
Metadata types are those that specific content types aggregate with the base types to provide specific, well-known properties that are specific to a type of content.
元数据类型是特定内容类型与基础类型聚合的类型，提供特定于某类内容的特定属性。
Metadata types are those that specific content types aggregate with the base types to provide specific, well-known properties that are specific to a type of content.
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