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W3C XML Schema provides very weak support for unordered content.
When the designer of an XML vocabulary does not wish to force child
elements to occur in a particular order, it can be impractical to
describe the XML vocabulary using XML Schema, because XML Schema
imposes such limitations on its "all" element as to make it virtually
useless.
A D V E R T I S E M E N T
RELAX NG provides an "interleave" element, which is restricted
enough to be efficiently implementable but provides adequate support
for designers who do no wish to allow flexibility in the ordering of
child elements.
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