Normal Character
Any XML character that is not a metacharacter. In regular expressions, a normal character is an atom that denotes the singleton set of strings containing only itself.
Syntax
Char :: = [^.\?*+|{}()#x5b#x5d]
Remarks
Note that a normal character can be represented either as itself or by using a character reference.
See Also
Reference
XML Schema Regular Expressions
XML Schema Regular Expressions Reference Chart
Atom