phase

<xsd:attribute name="phase" default="bubble">
  <xsd:simpleType>
    <xsd:restriction base="xsd:string">
      <xsd:enumeration value="capture"/>
      <xsd:enumeration value="target"/>
      <xsd:enumeration value="bubble"/>
      <xsd:enumeration value="default-action"/>
    </xsd:restriction>
  </xsd:simpleType>
</xsd:attribute>