hi
try this
if u consider the below as class diagram in UML using Rational Rose Software
-----------------------------------
| <<abstract>> |
| MyClass |
-----------------------------------
|<<property>> + a : int |
|<<property>> + b : string |
-----------------------------------
|<<abstract>> # Job() : void |
|<<abstract>> # Job2() : string |
|- SomeNonAbstractMethod() : void |
-----------------------------------
the Abstract Property will be specified as above