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RE: [xml-dev] US-ASCII characters versus XML characters ... why such a huge discrepancy?

At 2012-10-01 15:01 +0000, Costello, Roger L. wrote:
>Ken Holman wrote:
> > XML Schema does not constrain character sets.
>I don't understand this. If I have a pattern facet that specifies 
>any of the 28 characters not supported by XML
>     <xs:simpleType name="characters">
>         <xs:restriction base="xs:string">
>             <xs:pattern value="[&#1;-&#127;]*" />
>         </xs:restriction>
>     </xs:simpleType>
>then I get this error:
>     Character reference &#1; is an invalid XML character

You don't show us the entire schema expression.  If you don't have 
<?xml version="1.1"?> at the top, then *you* have made the mistake of 
making a file that is not XML well-formed.  The error you are getting 
isn't from the W3C Schema processor, it is likely from the XML 
processor.  Until I see that you have used a well-formed file, I'm 
not going to judge the abilities of the W3C Schema processor.

GIGO - if you put in garbage, you'll get out garbage.

>I conclude that XML Schema does constrain character sets -- it 
>constrains the character set to that of XML. No?

Hold the phone here ... XML Schema is built on top of XML.  It 
doesn't add anything to XML's base definition and I'm surprised 
anyone would expect it to.

I think you've just slipped on your perspective here, Roger ... I'm 
surprised you are taking the direction you are with this argument.  I 
suggest you go back to first principles and figure out where you are 
going off on a tangent.

. . . . . . . . Ken

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