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As depicted under A1 in the above image, the loader will create a default root node named "@".  For each codeSystem in the load source, the loader will create a LexGrid Entity (A3) and a "hasSubtype" association (A2) with the "@" root node.  The LexGrid Entity representing a codeSystem will have its entityCode value comprised of the codeSystem's name attribute value and the codeSystem's codeSystemId attribute value concatenated with the colon (":") character as depicted by the value "ConceptStatus:2.16.840.1.113883.5.1086" under A3. 

For each concept contained by a codeSystem, the loader will create a LexGrid Entity (A5) and a "hasSubtype" association (A4) with respective LexGrid Entity (A3) representing the codeSystem. 

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