how to add custom properties to UML solution?

[E. van Meeuwen]

Hi there,

I'm looking for a way to add custom properties to some elements/entities of
the UML solution.
For example, I want to
* add the properties 'extendedName : String' and 'GUID : String' to each
class-element.
* add the property 'stringLength : Integer' to each attribute of the class.
* add the property 'readonly : Boolean' to each association between classes.

Is this possible?
Note: I'm coming from Rational Rose where this is possible. Now I'm trying
to get my tool also running when drawing the
diagrams in Visio.

Best regards,
E. van Meeuwen