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XamlName Grammar
The following is the normative grammar for a string that is used as a name or key in Silverlight.
XamlName ::= NameStartChar (NameChar)*
NameStartChar ::= LetterCharacter | '_'
NameChar ::= NameStartChar | DecimalDigit
LetterCharacter ::= ('a'-'z') | ('A'–'Z')
DecimalDigit ::= '0'-'9'
CombiningCharacter::= none
Remarks
Characters are restricted to the lower ASCII range, and more specifically to Roman alphabet uppercase and lowercase letters, digits, and the underscore (_) character.
The Unicode character range is not supported.
A name cannot begin with a digit. Some tool implementations prepend an underscore (_) to a string if the user supplies a digit as the initial character.
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