Cart
[Home] [By Thread] [By Date] [Recent Entries]
Depends on what you mean by "allowable". If you mean, what characters will appear in your documents (where you presumably limit the characters to ASCII characters in some fashion), I believe you're correct. If you mean what characters an XML Schema-based validator will accept, it would be all of the Unicode characters that match the NCName production, regardless of whether they're ASCII or not. -- Ron Roger L. Costello wrote: > Hi Folks, > > Suppose that I create XML documents, restricting myself to just using the > ASCII character set. > > And suppose that I declare an element to have the datatype NCName: > > <element name="foo" type="NCName"/> > > What are the allowable characters for <foo>? > > I believe that the answer is: [a-zA-Z_][a-zA-Z0-9.-_]* > > Here's how I arrived at my answer: > > The production rule for NCName in the XML specification: > > NCName ::= (Letter | '_') (NCNameChar)* > > NCNameChar ::= Letter | Digit | '.' | '-' | '_' | CombiningChar | Extender > > Given that I am just using the ASCII character set, > > Letter is a-zA-X > Digit is 0 - 9 > CombiningChar and Extender are characters outside the ASCII character > set (I think) > > Do you agree that, given the restriction of using only ASCII characters, the > set of characters that can be used in <foo> is: [a-zA-Z_][a-zA-Z0-9.-_]*
|
