org.freedesktop.DBus.Properties.xml

<interface name='org.freedesktop.DBus.Properties'>
  <method name='Get'>
    <arg name='interface' direction='in' type='s'/>
    <arg name='propname' direction='in' type='s'/>
    <arg name='value' direction='out' type='v'/>
  </method>
  <method name='Set'>
    <arg name='interface' direction='in' type='s'/>
    <arg name='propname' direction='in' type='s'/>
    <arg name='value' direction='in' type='v'/>
  </method>
  <method name='GetAll'>
    <arg name='interface' direction='in' type='s'/>
    <arg name='props' direction='out' type='a{sv}'/>
  </method>
</interface>