length « XML Schema « XML Tutorial

3.64.1.To specify the exact length of an element
3.64.2.A fixed number of units can be specified using the length facet
3.64.3.length Defines the number of units of length using a nonnegative integer
3.64.4.Restrict the length of the text node
3.64.5.Restricting a type derived from the built-in string type to have a one-character length
3.64.6.Restrict the length of the code string and the characters