/*
 * ENUM: SE_MODEL_TYPE_ENUM
 *
 *   Used by <Model> to identify how it is referenced within a transmittal.
 *
 *   SE_COMPONENT_MODEL - This <Model> is referenced only as a component of
 *                        other <Models>. Cannot be referenced directly from
 *                        <Environment Root>.
 *
 *   SE_ROOT_MODEL - This <Model> is not instanced by another <Model>. Can be
 *                   referenced from <Environment Root>.
 *
 *   SE_BOTH_ROOT_AND_COMPONENT - This <Model> is both instanced by other
 *                   <Models> and instanced as a root <Model>. Can be
 *                   referenced from <Environment Root>.
 *
 *   Note that "name" for a <Model> with SE_ROOT_MODEL or
 *   SE_BOTH_ROOT_AND_COMPONENT must be unique. See associated
 *   <Unique Root Model Name> business rule.
 */