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Processing order

When a model is synchronized, Veda reads every selected workbook (in parallel), then applies the tables in a fixed order. The order matters in two ways: a rule can only find what has already been built, and when two rows of one layer set the same value, the one applied later wins (Files and layers). Between layers, which value a case uses is decided by the case order instead (Cases).

|| marks steps whose files or tables are processed in parallel.

1. The base model

  1. || ~FI_Process and ~FI_Comm in all VT_* and SubRES_* files, and ~FI_Comm in SysSettings.
  2. || ~FI_T in all VT_* and SubRES_* files.
  3. The tags that are not recommended but still have an effect: ~COMEMI, ~PRCCOMEMI, ~COMAGG, ~COMAGG_R1C2.
  4. ~TFM_AVA / ~TFM_AVA-C / ~ReplicateInRegions: repository processes and commodities are placed in their regions.
  5. Trade links.
  6. ~TFM_COMGRP.
  7. The topology tags, by file type in the order BY_Trans, SubRES_*_Trans, trade, regular, NSV, SysSettings; for each type, ~TFM_TOPDINS and then ~TFM_TOPINS.

Declare each process and commodity once

Because the declaration tables are read in parallel, two declarations of the same process or commodity with different characteristics (for example two timeslice levels) give a result that can change from one sync to the next. Declare each item exactly once.

2. The layers

Then each layer is built, one after another, in this order:

  1. BY_Trans.
  2. || SubRES_*_Trans files.
  3. Demand projections.
  4. Trade layers, by name.
  5. Regular layers, by name, one at a time.
  6. || No-seed-value layers.
  7. ~UC_T tables collected so far, so that parametric layers can modify the user constraints.
  8. Parametric layers.
  9. ~UC_T tables of the parametric layers.
  10. SysSettings.

Within each layer's workbook, the tag types are applied in this order:

  1. ~TimeSlices
  2. ~TFM_FILL-R
  3. ~TFM_DINS (and variants)
  4. ~TFM_INS (and variants)
  5. ~TFM_UPD and ~TFM_MIG (and variants), side by side

Within one tag type, tables are taken by file name, sheet position, tag row and tag column, and each table row by row. So within a layer, a UPD row always comes after every INS row, wherever the two sit on the sheet, and a row further down a table comes after the rows above it.

UPD and MIG on the same item

~TFM_UPD and ~TFM_MIG of one layer run side by side and do not see each other's output. If both write the same item, which one survives is not defined. Keep such rules in separate layers, or combine them in one tag.

Rules in ~TFM_UPD and ~TFM_MIG read their seeds from the layers that are already finished (seed values), not from rows of their own table: the rows of one UPD table are independent of each other. Conditions (attrib_cond, val_cond) also see what earlier ~TFM_DINS / ~TFM_INS rows of the same layer wrote.