What is the relationship between SLED and OpenSUSE?

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http://unix.stackexchange.com – I have read that OpenSUSE is to "SUSE Linux Enterprise Desktop" what Fedora is to Red Hat Enterprise Linux, but is there a document that explains this in more detail? For example, from what version of OpenSuse is SLED 11 built? What are the update policies of the two distros? (Edit: Someone asked something similar here) (HowTos)