<?xml version="1.0" encoding="UTF-8"?>

<vapor>
        <class name="Person">
                <attribute name="name" type="String" />
                <attribute name="gender" type="String" />
       </class>
       <class name="Student" superclass="Person">
               <attribute name="student_id" type="Integer" />
               <attribute name="attends" type="Reference" />
               <attribute name="enrollment_date" type="Date" />
       </class>
       <class name="University">
               <attribute name="name" type="String" />
               <attribute name="employees" type="Reference" is_array="true" />
       </class>
</vapor>
