<xsd:complexType name="courseInstanceT" >
  <xsd:annotation>
    <xsd:documentation>Course instance in a particular period, semester or academic year.</xsd:documentation>
  </xsd:annotation>
  <xsd:sequence>
    <xsd:element name="code" type="tns:courseCodeT"/>
    <xsd:element name="studyCredits" type="tns:studyCreditsT">
      <xsd:key name="courseInstanceStudyCredits_uniqueUnit">
        <xsd:selector xpath="tns:value"/>
        <xsd:field xpath="@unit"/>
      </xsd:key>
    </xsd:element>
    <xsd:element name="contactHours" type="tns:contactHoursT"/>
    <xsd:element name="period" type="tns:academicPeriodSinceT"/>
    <xsd:element minOccurs="0" name="lecturerId" type="tns:organizationalPersonalIdT"/>
  </xsd:sequence>
</xsd:complexType>