xpathAxis

<xsd:simpleType name="xpathAxis">
  <xsd:restriction base="xsd:NMTOKEN">
    <xsd:enumeration value="child"/>
    <xsd:enumeration value="attribute"/>
    <xsd:enumeration value="self"/>
    <xsd:enumeration value="parent"/>
    <xsd:enumeration value="descendant-or-self"/>
    <xsd:enumeration value="descendant"/>
    <xsd:enumeration value="following"/>
    <xsd:enumeration value="following-sibling"/>
    <xsd:enumeration value="ancestor"/>
    <xsd:enumeration value="ancestor-or-self"/>
    <xsd:enumeration value="preceding"/>
    <xsd:enumeration value="preceding-sibling"/>
  </xsd:restriction>
</xsd:simpleType>