Bug 95679

In some cases it would be nice if schema2beans would generate interfaces for
common properties in the generated classes:

Example:
8<-----------example dtd----------------->8
<?xml version="1.0" encoding="UTF-8"?>

<!ELEMENT root (image, label)>
<!ELEMENT image(position, path)>
<!ELEMENT label(position, text)>
<!ELEMENT path (#PCDATA)>
<!ELEMENT text (#PCDATA)>
<!ELEMENT position >
<!ATTLIST position 
x NMTOKEN #REQUIRED
y NMTOKEN #REQUIRED>

8<---------------------------->8

In a case like this I usually add an interface (PositionProvider) manually to
the generated classes Image and Label, to ease the access for the position property.

Especially for large dtds I either end up using reflection a lot or I have to
create lots of interfaces to make it easier to work with generated classes, and
- most important - I would rather not tamper with generated classes. 

It would be much nicer if there was a flag for the autogeneration of such
interfaces. 

Would this be feasible?