Is this invalid?

[Lars Marius Garshol]

* Didier PH Martin
| 
| Is this markup an invalid XML element?
| 
| <!AFDR "ISO/IEC 10744:1997">

No. It's not an XML element at all, it's an invalid declaration, since
XML does not have AFDR declarations.
 
| IE 5.x XML parser reject this markup as an invalid element
| 
| Declaration has an invalid name. Line 1, Position 3
| 
| <!AFDR "ISO/IEC 10744:1997">

In fact it recognizes it to be a declaration, but rightly complains
that it's not recognized.
 
| <!DOCTYPE....> ???, <!doctype....> ???, both ????

Only DOCTYPE.

| <!SGML...> ????, <!sgml..> ???, both ???

None of these are allowed. From an SGML point of view XML has a fixed
SGML declaration, from the XML point of view there is no such thing as
an SGML declaration.
 
| In which document is this listed? I know that these are all valid
| SGML markup and there is ISO documents on it, but where can I find
| W3C documents giving that information?

The XML specification would be an obvious place to look:

<URL:http://www.w3.org/TR/REC-xml>

--Lars M.


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