Re: [Psidev-ms-dev] cvParam for mass analyzer in <scan>

[Kessner, D. E. <Dar...@cs...>]

> I do not like the idea of putting the mass analyzer type cvParams 
> in multiple places (i.e. both in the scan element and in the 
> instrument)

I agree that it's a good principle to avoid duplicated information.  But
I think that it's important to make the most common use cases most
convenient.

An example of this is the 'msLevel' attribute, which can be found in the
filter string as well, but since it is commonly used to do quick
filtering of the spectra, the information is duplicated and placed in a
convenient place.  In our software tools, the first filtering done is
always by msLevel and massAnalyzerType.

I also agree that we can hide the indirection.  But there will be other
writers and parsers that will also have to deal with this common
scenario.  (It's actually more annoying for mzML writers, which would
have to keep an internal map from the filter string fragment to the
multiple <instrument> entries in order to write out <spectrum>
elements.)


Darren



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