DMN Decision Table orientation - Rules as crosstab support

When looking at pages 82 and 83 the DMN specification [1], about decision table orientation: we can read: "The table SHALL be arranged in one of the following ways (see Figure 8.5, Figure 8.7, Figure 8.9)."

• Figure 8.5: rules as rows
• Figure 8.7: rules as columns
• Figure 8.9: rules as crosstab (~ a matrix)

At the moment we only support "Rules as rows",
in order to have exhaustive compliance with DMN specifications, we need to implement the support for Rules as crosstab.

[1] https://www.omg.org/spec/DMN/1.2/PDF