Best practices for multiple measurements with different volumes

[danolson1]

I have a set of 4 similar reactions that I'd like to group together in a single EnzymeML file, but they have slightly different assay volumes. Here are some approaches I'm considering:

1. Create different vessels for each assay, each with its own volume. The problem with this is that since proteins, reactions, and small_molecules are assigned to a single vessel, I have to make copies of them, and keeping track of each copy may be complicated. If the vessel_id field could take a list of values, that would solve the problem, but I get a validation error when I try to do this.

2. Use a single vessel, but have a variable volume. I'm assuming the volume could be set at the measurement level, but I don't see a parameter for it.

[danolson1]

The lack of a vessel assignment for measurements may create additional problems with approach #1.