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As depicted under A1 in the above image, the LexEVS loader will create a default root node LexGrid Entity named "@".  For each codeSystem XML element in the load source, the LexEVS loader will create a LexGrid Entity (A3) and a "hasSubtype" association (A2) with the "@" root node where the the "@" root node entity is the source entity and the codeSystem entity depicted by (A3) is the target entity.  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 LexEVS loader will create a LexGrid Entity (A5) and a "hasSubtype" association (A4) with the respective LexGrid Entity (A3) representing the codeSystem where the codeSystem entity (A3) is the source entity and the concept entity (A5) is the target entity..  The LexGrid Entity representing a concept XML element will have its entityCode value comprised of the code attribute value of the code XML element contained by the concept XML element and the value of the conceptProperty XML element contained by the concept XML element where the conceptProperty element has a type attribute value defined as the concept's internal identifier type ("internalId").  These two values are concatenated with the colon (":") character to create the entityCode value of the LexGrid Entity as depicted by the value "A:19960" under A5.

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