Instead of having two handles for xenstore functions, xs_handle and
xs_transaction_handle, wouldn't it be easier to just put the
xs_transaction_handle in the xs_handle? 
If users wanted to make a single xs_read or xs_write, they wouldn't have
to open xs_handle, open xs_transaction_handle, read or write, close
xs_transaction, and close xs_handle. The transaction could be done for
them. 
If, however, they want to a multi command transaction, they still use
xs_transaction_start and xs_transaction_end. These functions would open
the xs_transaction_handle and assign it to the xs_handle. 
The xs_read and other functions would check to see if that transaction
handle exists. If it doesn't, they'd open and close it. 
Just a thought.....
Thanks,
Dan
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