The cell string type further defines the cell by enforcing the constraint that a cell can only contain a value of 1 through 9 and a period.
单元格字符串类型进一步定义单元格，把其中的值限制为1到9的值和点号。
The dmoType attribute value for hosting requirements, specifies the constraint to a type of capability.
这个托管需求的dmotype属性确定了对性能类型的限制。
Notice that the constraint specifies that the generic type can only be instantiated with a value type.
请注意，该约束指定泛型类型只能使用值类型进行实例化。
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