Thank you Hanks, seems to work well after some tweaking.

I had an issue, the patch you sent me gave an error when I ran 'context --make'. The error said:

tex error       > tex error on line 51 in file core-dat.mkxl: Parameters must be numbered consecutively
[#1]#*[
<to be read again>
    S
<line 3.51>
    \permanent\tolerant\protected\def\setdataset[#1]#*[#S
    #2]#*[#S#3]%
<empty file>
I've inserted the digit you should have used after the #.

I edited line 51 as:
\permanent\tolerant\protected\def\setdataset[#1]#*[#2]#*[#3]%
Instead of your original: 
\permanent\tolerant\protected\def\setdataset[#1]#*[#S#2]#*[#S#3]%

And now context --make runs, and the example compiles correctly, however, not really sure if what I did was the right thing to do.

Thank you so much for your help!

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