Dealing with packages and bundles

[Craig Hoyt <craig at aztech4mac dot com>]

I have two issues regarding packages or bundles. When crawling a  
volumes directory the <.Directory=True> reports a package or bundle  
as a folder (and rightly so). How can I identify all forms of  
packages and bundles so I can skip over examining their contents and  
just accept the item as a file as the Finder does?
On the flip side... how does one create such a package or bundle? Is  
it just create a folder and set some attributes to it?
Any ideas on either or both? I'm using 2005r2 Mac OSX 10.4.6
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