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

Concepts

Data Type Facets