I'm new to XML schema and am confused on how I would create a schema that introduces a set of arbitrary grouping for a set of elements. For example: <x> <a/> <b/> <c/> <d/> <e/> <f/> </x> or <x> <group> <a/> <b/> </group> <c/> <group> <d/> <e/> <f/> </group> </x> or perhaps <x> <a/> <group> <b/> <c/> <d/> </group> <e/> <f/> </x> would all be considered valid. Additional constraints are that any number of groups can occur, but the elements a through f can each only occur a maximum of once inside the x element whether they are children of a group or not. Peter Hunsberger
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