若要加入xml常值中不显著的泛空白字元，请使用包含字串常值并具有泛空白字元的内嵌运算式。
To include insignificant white space in an XML literal, use an embedded expression that contains a string literal with the white space.
输入遮罩可以包含常值和可编辑的字元。
您可以使用两种方式将常值强制为特定的资料型别：一是附加型别字元，另一则是将它放在封入字元中。
You can coerce a literal to a particular data type in two ways: by appending a type character to it, or by placing it within enclosing characters.
传回格式化字串的子字串，选择性包含提示、常值和密码字元。
Returns a substring of the formatted string, optionally including prompt, literal, and password characters.
传回格式化字串的子字串，选择性包含提示、常值和密码字元。
Returns a substring of the formatted string, optionally including prompt, literal, and password characters.
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