Extended properties can specify a caption for a table or view or an inputmask for a column.
扩展属性可以为表或视图指定标题，也可以为列指定输入掩码。
2
If the entire string only contains valid characters, according to their paste position in the inputmask, then the entire operation will succeed.
如果整个字串仅包含有效的字元(根据其在输入遮罩中的贴上位置)，整个作业将会成功。
3
This converter expects users to input data in the format (pattern) specified in the mask attribute and then knows to translate the input into a basic string.