+ <!--
+ value Attach=7 is still contained in XI.h as "#define AttachClass"
+ but it was never transmitted over the protocol.
+ (It was used to tag a fake class created by libXi).
+
+ Even the creation of that fake class has been dropped
+ from libXi in 2009 by the following change:
+ http://cgit.freedesktop.org/xorg/lib/libXi/commit/?id=62858c426e6de1b99df660251737233afd335302
+
+ <item name="Attach"> <value>7</value> </item>
+ -->