cannonical ordering in the XML

Hi,

The spec for owl 1.1 defines equality over expressions. However, I can't see 
where it defines ordering over expressions. The haskell code I've got does 
provide a total ordering over all bits of the owl 1.1 syntax, meaning that I 
always process/serialize statements in a consistent order. This is 
particularly important in the xml serialization, particularly if we wish to 
be able to do diffs.

Have I missed the bit that talks about cannonical orderings? Is there an 
expected (although not required) order in which we should serialize elements 
to xml?

Thanks,

Matthew