The beta version of the current working draft of the new OMG paper can be found here: http://www.omg.org/spec/CMMN/1.0/Beta1/.
This figure 72 shows an example, how a case (here: writing a document) can be modeled using CMMN elements:
Table 43 explains, where the different types of decorators can be used:
The meaning if the elements and the decorations are explained in the CMMN beta document.