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This piece of script allows you to make complex set modifier and formula definitions inside of a simple, easily readable and maintainable INLINE or Excel table. You will be able to define filter sets in such a simple way, that each data owner from the business can maintain the definitions (and doesn't need to hold QV-certificate in Design/Developmen) because there won't be a need to know the set modifier syntax. Even set operations (+, -, *, / ) can be defined very easily in a simplified syntax.
Giving you an example: Your formula to calculate the current previous-year's versus this month's sales as a percentage would be
SET xSalesDiff = Num(Sum({<[Year]={'2013'}, [Month]={'Oct'}, [Store]={'Abel'}>} Sales)/Sum({<[Year]={'2012'}, [Month]={'Oct'}, [Store]={'Abel'}>} Sales) -1, '0,0%');
Using FORSEMO the same definition will be generated automatically if you provide the following table:
| KPI | Formula | Format | Year§1 | Month§1 | Store§1 | Year§2 | Month§2 | Store§2 |
| xSalesDiff | Sum(§1 Sales)/Sum(§2 Sales) -1 | 0,00% | 2013 | Oct | Abel | 2012 | Oct | Abel |
You can even trigger more complex set operators in a readable syntax. e.g. If you put in column Year§1
- -2013 .... this will turn into <Year -= {2013}>
- +'2010','2011' -'2013'.... this will turn into <Year += {'2010', '2011'} - {'2013'}>
Check out my 5"-Flash-video and you will understand, then get your FORESEMO masters degree by reading through my script inline remarks documentation. 
