Here are links to two very good technical resources for SNOMED CT. I referenced them extensively when modeling SNOMED in the Teradata Healthcare data model (HC-LDM.)
Technical Implementation Guide for RF2
http://www.ihtsdo.org/fileadmin/user_upload/doc/tig/index.html?q=/fileadmin/user_upload/doc/tig/rf2/rf2_title.html
IHTSDO Glossary - (DRAFT VERSION)
http://www.ihtsdo.org/fileadmin/user_upload/doc/gl/index.html?q=/fileadmin/user_upload/doc/gl/glrfn/glrfn_f2_ModuleId.html
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