Also you can read

http://mgrepl.wordpress.com/2012/03/23/when-should-you-use-the-optional_policy-block-statement/


Thanks! It's very rare to see SELinux dedicated blogs :) bookmarked it along with
Dominick and
Daniel's SELinux blogs.

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Cheers,
Lakshmipathi.G
FOSS Programmer.
www.giis.co.in