Bjoern Hoehrmann wrote:
> typically expanded to "XML Schema Document" or "XML Schema Datatypes" or

... or XML Schema Definition. Which of these meanings applies depends on 
the context in which the term is used.

> When used as namespace prefixes, they usually expand to different name-
> space names.

xsd: usually maps to "http://www.w3.org/2001/XMLSchema", which is the 
namespace for schemas themselves. You'd use this namespace to define the 
datatypes and normal structure of your document.

xsi: usually maps to "http://www.w3.org/2001/XMLSchema-instance", which 
is the namespace for schema-related information that appears in instance 
documents. You'd use this namespace to do things like say which schema 
document describes this document, or to state that an element is a 
particular sub-type of the type the schema requires it to be.



If that doesn't help you, ask a more specific question. Or perhaps just read
	http://www.w3.org/TR/2004/REC-xmlschema-0-20041028/
or another introduction to XML Schema and its uses. (Herewith, my 
standard plug for the many tutorials and articles at http://www.ibm.com/xml)


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