Now add a count to the element and set the value to 2. The rule is defined that counts the active selected elements and returns true if two elements are selected.

现在向元素中添加计数并把值设置为2。

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Jelliffe's formula was a count of element types, attributes, and various special cases of these measured either from a DTD or from one or more instance documents.

Jelliffe的公式是计算元素类型、属性和各种特殊情况的个数，可以使用DTD或者一个或多个实例文档。

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For example, suppose you want to perform a count of the rows where the XML data column has an element text with the value This should validate!.

例如，假设您想要计算其XML数据列的text元素的值为This should validate ！的行的数量。

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