In Section 2.5.3 Empty Content - 2nd paragraph in the XML Schema Part 0: Primer 
document published on May 2, 2001, I have identified the following error.

I think the following line: 

Such an element has no content at all; its content model is empty. To define a 
type whose content is empty, we essentially define a type that allows only 
elements in its content, but we do not actually declare any elements and so the 
type's content model is empty: 

should be read as: 

Such an element has no content at all; its content model is empty. To define a 
type whose content is empty, we essentially define a type that allows only 
attributes in its content, but we do not actually declare any elements and so 
the type's content model is empty: 

See:
http://lists.w3.org/Archives/Public/www-xml-schema-comments/2003OctDec/0009.html