position

<xsd:attribute name="position" use="optional" default="float">
  <xsd:simpleType>
    <xsd:annotation>
      <xsd:documentation/>
    </xsd:annotation>
    <xsd:restriction base="xsd:NMTOKEN">
      <xsd:enumeration value="anchor"/>
      <xsd:enumeration value="background"/>
      <xsd:enumeration value="float"/>
      <xsd:enumeration value="margin"/>
    </xsd:restriction>
  </xsd:simpleType>
</xsd:attribute>