yum: rpmUtils module does not contain transaction?

Hi,

I wanted to debug some other program which uses the rpmUtils package. The 
problem is that they do:
 > import rpmUtils
 > ts = rpmUtils.transaction.initReadOnlyTransaction()

With Python 2.5.1 (Fedora 8) this fails:
 > AttributeError: 'module' object has no attribute 'transaction'

And indeed, in rpmUtils/__init__.py there is no symbol named transaction. But 
there is a module called rpmUtils/transaction.py so this works for me:
 > from rpmUtils import transaction
 > ts = transaction.initReadOnlyTransaction()

However, the first pattern is used even in yum 3.2.20 so probably some Python 
wizard can explain this to me?

regards
fs

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