segments 

A segment defines the smallest unit within a possibly branching structure, such as a dendrite or axon. The first segment should represent the soma, if needed for downstream applications.

Element Information

Model

notes{0,1} , properties{0,1} , annotation{0,1} , group* , segment+
Children: annotation, group, notes, properties, segment

Source 

<xs:element name="segments" minOccurs="1" maxOccurs="1">
  <xs:annotation>
    <xs:documentation>A segment defines the smallest unit within a possibly branching structure, such as a dendrite or axon. The first segment should represent the soma, if needed for downstream applications.</xs:documentation>
  </xs:annotation>
  <xs:complexType>
    <xs:sequence>
      <xs:group ref="meta:metadata"/>
      <xs:element name="segment" type="Segment" maxOccurs="unbounded"/>
    </xs:sequence>
    <!-- <xs:attribute name="name" type="xs:string" use="optional"/> -->
  </xs:complexType>
  <!-- This needs further testing!! -->
  <xs:unique name="uniqSegId">
    <xs:selector xpath=".//segment"/>
    <xs:field xpath="@id"/>
  </xs:unique>
  <xs:key name="keySegment">
    <xs:selector xpath=".//segment"/>
    <xs:field xpath="@id"/>
  </xs:key>
  <xs:keyref name="segmentParentRef" refer="keySegment">
    <xs:selector xpath=".//segment"/>
    <xs:field xpath="@parent"/>
  </xs:keyref>
</xs:element>

Sample