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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 the respective LexGrid Entity (A3) representing the codeSystem.  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 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.

??? Notes about handling concepts having multiple codes and how scheme "code:internal Id" resolves issues.  Also, note code values are not guaranteed to be unique across the vocabularyModel ???  Also, notes about all codes being loaded regardless of their status (active vs. retired). 

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