z 

A point may also be provided in relation to a map. x, y and z may
be used in that case, z being the altitude. Altitude and z may be used at the
same time

Attribute Information

Used By

Complex Type PointType

Source 

<xs:attribute name="z" type="xs:string" use="optional">
  <xs:annotation>
    <xs:documentation xml:lang="EN">A point may also be provided in relation to a map. x, y and z may be used in that case, z being the altitude. Altitude and z may be used at the same time</xs:documentation>
  </xs:annotation>
</xs:attribute>

Sample