tobolar

Library officer check: - Modelica.Mechanics.MultiBody.Examples.Elementary.PointGravityWithPointMasses2 Checking https://www.ltx.de/download/MA/Compare_MSL_v4.1.0/Compare/Modelica/20240227232653/Modelica.Mechanics.MultiBody.Examples.Elementary.PointGravityWithPointMasses2/CSVCompare/PointGravityWithPointMasses2_report.html, the error message is: `6 (relative error is 1,81520807176844E-16)` So I really wonder why csv-compare catch this. Anyway - this example is fine...

> ZeroForceAndTorque inherits from the new partial model Interfaces.PartialOneFrame_a which includes outer world. Howerver, in ZeroForceAndTorque, world is not used. Therefore, it would be better to not inherit from a...

> I will try to improve the concept. What about to utilize the "selective model extension" and use `PartialTwoFrames` (containing both flange "a" and "b" and the world) instead of...

@HansOlsson @henrikt-ma Thanks for motivating myself to try this approach. I believe the approach is possible, but is this also a case which was intended / expected when adding "selective...

I realized I have to prepare several particular PRs first.

> That breaks some of the stated compatibility issues, but on the other hand it is a clear bug. To me it seems straight forward to have R_rel as a...

> However, one *could* argue that it isn't a new name as it was already documented. Good Idea. Yet another possibility would be to wait with merging till there is...

> * This proposal is not backwards compatible: Assume PartialForce is used outside of MSL, then this will give an error, because the new Partial Force has R_rel, which an...

@RaphaelGebhart Your comments are all fine. Additionally, this shall be documentad accordingly in the model. (I suppose you are not the only person who misunderstand the example.)

It seems MapleSim's moparser can yet not deal with the "selective model extension". ;-) https://github.com/modelica/ModelicaStandardLibrary/actions/runs/6848246047/job/18618044784