Is this issue wholly addressed by having a URI for the reference? Or is there 
some subtlety that I am missing here?

i.e. I would expect a minor version of a reference genome to have a different 
URI from a different minor version of the same major version of the reference 
genome …. am I naive?

I have noticed reference declarations that fall short of my ideal … e.g.

##reference=GRCh37.p5

##reference="hg19"

##reference=GRCh37

##reference=GRCh37
##reference=file:///humgen/1kg/reference/human_g1k_v37.fasta
##reference=file:///humgen/gsa-hpprojects/GATK/data/ucsc.hg19/ucsc.hg19.fasta

##reference=file:///humgen/gsa-hpprojects/GATK/data/ucsc.hg19/ucsc.hg19.fasta

My take is that the "hg19" is a bug, and should read 

##reference=hg19

and that somewhere I need some heuristics that convert these into URIs … (and 
which convert file:/// uris into something more useful)

Any hints as to how to interpret these would be welcome.

Jeremy


On Mar 20, 2013, at 3:19 PM, Joachim Baran <joachim.ba...@gmail.com> wrote:

> Hello,
> 
> On 20 March 2013 18:09, Jerven Bolleman <m...@jerven.eu> wrote:
> So instead of chromosome M you are really talking about assembly X of
> a set of reads R mapped via some (variant calling) processes to
> reference chromosome C that is also really an assembly of a different
> set of reads.
>   Just to add to Jerven's comment: even when referring to a reference 
> assembly, it is best to add "Which version?".
> 
>   Even when talking about reference genome assemblies, you have multiple 
> versions (including "patches"). Additionally, when interpreting the genomes, 
> you will also get different results from various institutes (genes from UCSC 
> are not the same as Ensembl).
> 
>   I think my point here is that chromosomes (or anything, really), has 
> provenance that needs to be explicitly denoted.
> 
> Best,
> Joachim
> 

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