Hi, How can I create a plugin, that can take a CDT as Input?

You could add a @Type annotation to the input

@Input(required = Required.OPTIONAL)
@Name("inputCDT")
@Type(name="myCDT", namespace="www.example.org/documentation")
          public void setInputCDT(TypedValue val) {
                    ..
          }

You could add a @Type annotation to the input

@Input(required = Required.OPTIONAL)
@Name("inputCDT")
@Type(name="myCDT", namespace="www.example.org/documentation")
          public void setInputCDT(TypedValue val) {
                    ..
          }