Do you mean that you would like to create a new class diagram from only
your UML model ?
If yes, then you can use EclipseUML 2008 which a tool for Java/JEE or UML
modelers who would like to become plumbers and not just designers :-)
Just past and copy the .uml file at the root of your project, then rename
your .uml in order to have the same name as your project. Finally click to
open your .uml file contextual menu > Open with > Omondo xmi editor.
You then can see your UML model inside the XMI editor. The XMI Editor is
an Omondo concept. If you don't understand this model concept based on UML
metamodel ( e.g. not on EMF transformation) please let me know and we will
add some documentations on our website.
The next step is to create your graphical view (e.g. have a class diagram
from your UML model). You just need to create a package or a class diagram
in your project, then drag and drop UML superstructure elements from the
xmi editor to your diagrams. You can select one or many elements at the
same time.
After the classes are inside your diagram you can navigate dynamically by
using the package or class diagram contextual menu (Show/ hide
inheritance, association, dependencies).