<xs:element name="SequenceNumber" type="xs:positiveInteger">
  <xs:annotation>
    <xs:documentation>The SequenceNumber element is a positive integer used in determining either the order within a set of PlanElements in which a plan element should be executed or which plan element in the set should be executed.</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:complexType name="NumberedPlanElementType">
  <xs:annotation>
    <xs:documentation>The NumberedPlanElementType defines a single ordered plan element.</xs:documentation>
  </xs:annotation>
  <xs:sequence>
    <xs:element name="SequenceNumber" type="xs:positiveInteger">
      <xs:annotation>
        <xs:documentation>The SequenceNumber element is a positive integer used in determining either the order within a set of PlanElements in which a plan element should be executed or which plan element in the set should be executed.</xs:documentation>
      </xs:annotation>
    </xs:element>
    <xs:element ref="PlanElement">
      <xs:annotation>
        <xs:documentation>The PlanElement element is the plan element associated with the SequenceNumber.</xs:documentation>
      </xs:annotation>
    </xs:element>
  </xs:sequence>
</xs:complexType>