Introduces the metadata section of the portlet.
引入portlet的元数据部分。
The order of the child elements is critical as it corresponds to the order of columns described in the metadata section.
这些子元素的顺序必须严格对应于metadata部分描述的列顺序。
The metadata section (shown below) contains metadata about the structure of the columns which our WebRowSet object consists of.
元数据部分(如下所示)包含关于列的结构的元数据，这些列组成了WebRowSet对象。
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