Why doesn't this instance document validate?

Can someone tell me why the attached instance document using the attached
schemas won't validate?  XML Spy is saying "This file is not valid:
Mandatory local element 'publisher' must be unqualified (i.e. outside of any
namespace), but you are using a default namespace".

 <<AuthorsAndPublishers.xsd>>  <<BookDatatypes.xsd>>  <<publisher.xml>> 

John P. A. Verhaeg
JVerhaeg@MetaMatrix.Com <mailto:JVerhaeg@MetaMatrix.Com>