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The "top node" is a representation of an OWL class that defines a set of properties, which provide human readable metadata about what this classification of values means. 

This node, the OWL defined relationships that point to it, and a set of properties key to defining aspects of a value set, allow LexEVS to adequately define this, both in terms of a Value Set Definition, and also as a Coding Scheme object.  The API's that work in conjunction with the externally defined value set definitions and resolved value set coding schemes can receive these objects transparently because they are the same type as previously defined for the legacy API.