Re: [xml-dev] Invalid Markup in External DTD conditionals

> 
> If you want historically reliable information on the thinking in the WG,
> I recommend reviewing the relevant threads in the mail archive at
> 
>  https://lists.w3.org/Archives/Public/w3c-sgml-wg/
> 
> 


Tim Bray's Annotated XML Specification is also a brilliant resource, though in this case I don't think it sheds any additional light.

https://www.xml.com/pub/a/axml/axmlintro.html

Michael Kay
Saxonica