create calculation "templates" that can be applied to datasets

[mejymejy]

the idea is that we can define a calculation without tying it to a dataset so that we can use it to create actual calculations (i.e. tied to a dataset). these can be applied one after another (in sets, even) so that you can apply the same calculations to different datasets

note: may need a better name

[mejymejy]

one (simple) way to do the grouping would be to use tags. that way you can, for example, apply all of the "WHO Health" indicators to your dataset at once

[pld]

One work flow we discussed is having a set of mappings and then calculations, suppose your dataset is in the UNICEF health format and you want to apply the WHO health indicators. You have two sets of calculations:

1. UNICEF health to WHO health calculations
2. WHO health calculations

Then you apply these to your dataset in order. The groups can be formed by tags and there's a way to apply all the calculations with the same tag.

conceptually:

          ---------------------------
 csv      |   mappings  indicators  |
------    |   ------    ------      |
|    |    |   |    |    |    |      |
|    |    |   |    |    |    |      |
------    |   ------    ------      |
          ---------------------------
             calculations for csv

but functionally:

 csv
------       ------        ------      
|    |  ->   |    |   ->   |    |
|    |       |    |        |    |
------       ------        ------
           apply calcs    apply calcs