do exclude lines in yum config files concatenate?

Some of my yum config files are developing exclude lines that are
getting long.  Is it possible to replace those long lines with
multiple lines, either with continuation characters or with 
extra lines starting with "exclude"?   I can't find this in
the docs.

Keith

-- 
Keith Lofstrom          [email protected]         Voice (503)-520-1993
KLIC --- Keith Lofstrom Integrated Circuits --- "Your Ideas in Silicon"
Design Contracting in Bipolar and CMOS - Analog, Digital, and Scan ICs