<xsd:simpleType name="studyLevelT" >
  <xsd:restriction base="xsd:int">
    <xsd:enumeration value="1">
      <xsd:annotation>
        <xsd:documentation>Student</xsd:documentation>
      </xsd:annotation>
    </xsd:enumeration>
    <xsd:enumeration value="2">
      <xsd:annotation>
        <xsd:documentation>Master student</xsd:documentation>
      </xsd:annotation>
    </xsd:enumeration>
    <xsd:enumeration value="3">
      <xsd:annotation>
        <xsd:documentation>Ph.D. student</xsd:documentation>
      </xsd:annotation>
    </xsd:enumeration>
    <xsd:enumeration value="4">
      <xsd:annotation>
        <xsd:documentation>Any level</xsd:documentation>
      </xsd:annotation>
    </xsd:enumeration>
  </xsd:restriction>
</xsd:simpleType>