Advanced XML editor for refactoring XSDs

Is anyone aware of an advanced XML(/XSD) editor that has refactoring
features aka. the ones known for ex. Java. They could be:

* refactoring logical layout. Between the diffent forms: Russian Doll,
Salami slice, Garden of Eden etc.
* refactoring physical layout. From schema modules to a flattend schema.
* namespaces. Changing prefix's over several modules, and or namespaces
URI's.
* naming. Element, attribute and types.

I am aware that some of these could be done by using some sort of 'replace',
but I often work with several schema modules with the same namespace. Also
XSL could/can do the job, but I would love to see it integrated in an
Editor, ex. as a plugin for Eclipse.

Also I would like to know of any tools for doing a logical comparison om
XSD's, like a XSD-diff, to be used in analysing diffent version of the same
schema.


--- 

Brian Nielsen 
IT-Strategic Division
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