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Re: [xml-dev] Allowable characters for NCName, assuming the ASCIIcharacter set?
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.-_]*
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