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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 XML element 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 XML element contained by a codeSystem XML element, the loader will create a LexGrid Entity (A5) and a "hasSubtype" association (A4) with respective LexGrid Entity (A3) representing the codeSystem.  The LexGrid Entity representing a concept will concept XML element will have its entityCode value comprised of the code attribute of the code XML element of contained by the concept and XML element and the value of the conceptProperty element of conceptProperty XML element contained by the concept XML element where the conceptProperty element has a type is attribute defined as the internal identifier type ("internalId").  These two values are concatenated with the colon (":") character as character to create the entityCode value of the LexGrid Entity as depicted by the value "A:19960" under A5. 

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