New link element relation types.
新的link元素关系类型。
Link relation extensions involve the creation of a new link element rel attribute value that identifies a new type of link relation.
链接关系扩展包括创建新的link元素和rel属性值，标识新的链接关系类型。
The relation type is defined by the rel attribute; for example, the value alternate signifies that the link provides an alternate representation of the resource described by the entry element.
关系类型在rel属性定义；例如，值alternate表明此链接提供了这个条目元素所描述的资源的另一种表示。
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