Arbitrary Set of Elements (xsd)

Hello Schema-experts,
I have a question about grouping of elements. 
Consider definitions of three different kind of elements, i.e. < e1/>,< e2/>, and < e3/> as instances of a schema
How can I define a grouping (in XML Schema) that allows any sequence of these elements with any possible amount of occurrences, like:

< e1/>
< e2/>
< e1/>
< e3/>
< e1/>
.... or any other sequence of these three elements?

I tried using the all-statement, but it is not allowed in a sequence-tag.
Thank you in advance for your support.

Best regards, Jan Mendling 
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Received on Tuesday, 17 December 2002 12:07:22 UTC