<xs:attribute default="0" name="brightness" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:annotation>
    <xs:documentation>Brightness adjustment for the layer. Positive values increase the whiteness of the layer, negative values increase the darkness of the layer.</xs:documentation>
  </xs:annotation>
  <xs:simpleType>
    <xs:restriction base="xs:double">
      <xs:minInclusive value="-1" />
      <xs:maxInclusive value="1" />
    </xs:restriction>
  </xs:simpleType>
</xs:attribute>