why use UIMA logging facility?

[Philip Ogren]

I am involved in a discussion about how to do logging in uima.  We were 
looking at section 1.2.2 in the tutorial for some motivation as to why 
we would use the built-in UIMA logging rather than just using e.g. log4j 
directly - but there doesn't seem to be any.  Could someone give us some 
intuition why it matters which logging library we use?  (I have my own 
suspicions - but that's all they are...)

Thanks,
Philip