An Atom Category is essentially a name-value pair (in Atom these are called Scheme and Term), associated with an Atom Entry as additional metadata.
一个Atom类别本质上是一个“名字-值”对(在Atom中被称为scheme和Term)，它作为附加元数据与一个Atom条目关联。
The description scheme divides the image information into metadata, visual feature and semantic feature and represents it by the XML norm in W3C.
该描述模式将图像信息分为元数据、视觉特征和语义特征三个层次来具体描述，并用W3C的XML规范进行表示。
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