xCBL 4.0 support on WM6

Is xCBL4.0 supported on WM6? I am aware that wmXCBL supports xCBL3.5. Does anyone have implemented successfully xCBL4.0 on WM6?

Even I am facing similar situtaion. Can anyone help me out. Is xCBL 4.0 supported by webMethods 6.1 version, webMethods B2B OnRamp for Commerce One MarketSite version 3.0. If not, please let me know which version supports it.