validate rss and atom

validate rss and atom
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http://feedvalidator.org/

http://rss.scripting.com/

http://www.walidator.com/

http://www.ldodds.com/rss_validator/

http://feeds.archive.org/validator

http://www.ldodds.com/rss_validator/1.0/validator.html

http://aggregator.userland.com/validator

http://www.w3.org/RDF/Validator/ (RDF validator)