For a domain element, the value of the attribute must start with a plus sign.
对于域元素，该属性的值必须以加号开始。
The value of the domain attribute on the r:ranking-scheme and r:rank elements is the IRI that identifies the domain.
ranking-scheme 和 r:rank 元素上的域属性的值是识别域的 IRI。
Make a separate table for each set of related attributes, and give each table a primary key. Each field contains at most one value from its attribute domain.
为每个相关属性的集合创建一个单独的表，并为每个表指定一个主键。每列最多包含一个来自其属性域的值。
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