Global Vs Root Element.

Hi,

 I am not too familiar with XML. Can some one tell me what is the difference between Global Elements and Root Elements. From what I understand from XMLSchema specification, we cannot impose any cardinality constraints on Global Elements. They can occur with multiple instances as top level elements. I am confused how they are different from Root Element, which can be only one element. Thanks in advance.

Best Regards,

Venkateswar.