Content-statistics.class

<xs:group name="Content-statistics.class">
  <xs:choice>
    <xs:element ref="mean"/>
    <xs:element ref="sdev"/>
    <xs:element ref="variance"/>
    <xs:element ref="median"/>
    <xs:element ref="mode"/>
    <xs:element ref="moment"/>
    <xs:element ref="momentabout"/>
  </xs:choice>
</xs:group>