Masked Keyword Types must have values entered in a specific format, called a mask format. Fields for masked Keyword Types prohibit you from typing values that do not satisfy the mask format.
For example, a masked Keyword Type for Social Security Numbers may contain dashes as static characters and allow users to enter only nine numeric characters. The dashes are entered automatically as the subsequent characters are typed.
Depending on your system's configuration, a mask may also be applied to certain Keyword Values upon retrieval.
The mask format is displayed after placing your cursor in the Keyword Type field, as shown in the following example: