will be converted to an <class>Attrs</class> class on the
fly (and will generate a <class>DeprecationWarning</class> when
the class is created). An <class>Attrs</class> class will
be generate d from an <lit>attrHandlers</lit> attribute,
+automatically generate an <lit>attrHandlers</lit> attribute,
so it's possible to derive from new element classes in the old way.
The only situation where this won't work, is with
attributes where the Python and &xml; name differ, you