what is the meaning of validity, truth, and soundness as they relate to the area of logical syllogism?

Question

http://en.wikipedia.org/wiki/Syllogism

http://www.philosophyclass.com/logic.htm

These two sites will explain syllogisms very well.

Since this is not my area of expertise, I searched Google under the key words "logical syllogism validity truth soundness" to get these possible sources:

http://www.classical-homeschooling.org/dialectic/logic.html
http://philosophy.lander.edu/logic/syllabus_tvs.html
http://philosophy.lander.edu/logic/syllabus/node6.html
http://en.wikipedia.org/wiki/Validity
(Broken Link Removed)

I hope this helps. Thanks for asking.