Hello all,
one more question, which seems to me that it is not clear at all:

How can a xml document be validated against a schema if the schema has also references to other xsd documents????
( In other words: If the whole schema consists of many files ))

As i know I can give in Java just one Schema-file to validate it against a xml document.

Cheers

This depends on the schema validator you are using.

One way is to reference a schema document that contains xs:includes or xs:imports for all the other schema documents.

But you may also be able to specify multiple schema documents directly. You can with Saxon, for example, by using configuration.addSchema().

Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference