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Re: blog: semantic dissonance in uniprot

From: Pat Hayes <phayes@ihmc.us>
Date: Thu, 26 Mar 2009 10:42:04 -0500
Cc: "W3C HCLSIG hcls" <public-semweb-lifesci@w3.org>
Message-Id: <056E7617-528A-439E-BF26-53925FA5F07F@ihmc.us>
To: "Michel_Dumontier" <Michel_Dumontier@carleton.ca>

On Mar 26, 2009, at 8:28 AM, Michel_Dumontier wrote:

> Pursuant to my email, and in light of several other comments, if our
> goal is to now rectify what Uniprot:Protein _actually_ means in our
> domain, and how it can be semantically mapped to other bio-ontologies,
> then I might also suggest that instances of Uniprot:Protein are
> aggregates of proteins (err... :ProteinAggregate anyone?), possibly
> separated by both space and time, having a similar (base sequence +
> mutations / ptms) composition, sharing certain characteristics (e.g.
> functionality, domains) and observed to participate in biological
> processes. Clearly not a type of protein of the single molecule form,
> but again, certainly not a Record.

Indeed. If I might make a suggestion, rather than talking about  
'aggregates' (which sounds disturbingly, er, philosophical), why not  
just say that the entity being identified is a _substance_. Substances  
are 'kinds of stuff' that include mixtures (eg concrete is a kind of  
stuff comprising a mix of sand, crushed rock, cement and water in  
several possible proportions) but also 'pure' stuffs such as water.  
Note the distinction between a substance and a piece of the substance  
(concrete, the building material vs,. this or that lump of concrete)  
or a mereological sum (your 'aggregate', I think) of such pieces (all  
the concrete in America). The utility of this is that it eliminates  
the discussions about molecules, which I think is getting in the way  
of clarity here.  Regarding sameAs, being the same substance is a very  
strict kind of sameAs, of course, but it really does only refer to  
substances, which is a step in the right direction. Each protein is a  
substance. It might turn out that one protein is a mixture of others,  
for example: this is fine, nothing breaks, as long as nobody says the  
mixture is sameAs one of its components. And now one can have notions  
such as 'purified form of' or 'isotopic version of' between  
substances, which might help to make all these distinctions that you  
chemists need to be concerned with.

Distinctions like object/substance/piece/mixture were worked out by  
ontologists over 20 years ago, by the way. None of this is rocket  
science.

Pat


>
> -=Michel=-
>
>
>
>>
>> If however, what we've been talking about is that identifiers like
>> 	http://purl.uniprot.org/uniprot/Q16665
>>
>> are actually database records, and not molecular entities, then we  
>> can
>> settle this quickly:
>>
>> Uniprot RDF file: http://www.uniprot.org/uniprot/Q16665.rdf
>> (is this what people were referring to as a Record???)
>>
>> Contains:
>>
>> <rdf:Description rdf:about="http://purl.uniprot.org/uniprot/Q16665">
>> <rdf:type rdf:resource="http://purl.uniprot.org/core/Protein" />
>>
>>
>> It's clear that the entity denoted by :Q16665 is rdf:type :Protein  
>> and
>> is the subject of statements that are biological in nature such as
>> being
>> located in sub-cellular compartments or being involved in biochemical
>> reactions. It is clearly not a Record. This is generally the case for
>> nearly all entries in biomolecular databases.
>>
>> Cheers,
>>
>> -=Michel=-
>>
>> Anxiously waiting see if this clears up things or generates
> controversy
>> .. it's hard to predict!
>>
>>
>>
>>> If nobody ever wants to use the same property to talk about the
>>> database
>>> record as was used to talk about the molecule, and nobody ever makes
>> an
>>> assertion that implies that the class of database records is
> disjoint
>>> from the class of molecules, then I don't see any harm in using the
>>> same
>>> URI to ambiguously denote both.   But if one is trying to design
> data
>>> to
>>> be reusable by others in unforeseen ways, there clearly *is* a risk
>>> that
>>> someone will want to make such assertions in conjunction with the
>> data,
>>> and if that happens there is a clear harm.  This risk is easy to
>> avoid
>>> by using separate URIs.
>>>
>>> There *are* trade-offs.  Minting two URIs instead of one *does* add
>>> some
>>> complexity, though as I pointed out that additional complexity can
> be
>>> mitigated to the point that it is a *very* low cost.  Still,
>> different
>>> people will weigh these trade-offs differently, and what's best for
>> one
>>> situation may not be best for another, as I indicated in my original
>>> post.
>>>
>>> Furthermore, even if one does use the same URI to ambiguously denote
>>> both a database record and a molecule, that is not the end of the
>> world
>>> either.  It is possible (though more difficult) to later separate
> out
>>> and relate the different senses of an ambiguous URI, as I have
>>> described:
>>> http://dbooth.org/2007/splitting/
>>> Ambiguity is inescapable, and ambiguity between a thing and a page
>> that
>>> describes that thing is not fundamentally different from other kinds
>> of
>>> ambiguity (except perhaps that we are aware of it in advance and it
>> can
>>> be easily avoided), as explained here:
>>> http://dbooth.org/2007/splitting/#httpRange-14
>>>
>>> Finally, although it is flattering that you have named this
>> suggestion
>>> after me, I cannot take credit.  As I pointed out in my original
>> post,
>>> the suggestion to differentiate between a molecule and the database
>>> record that describes that molecule originates with the Architecture
>> of
>>> the World Wide Web:
>>> http://www.w3.org/TR/webarch/#URI-collision
>>> and best practices for implementing this distinction are described
> in
>>> Cool URIs for the Semantic Web:
>>> http://www.w3.org/TR/cooluris
>>>
>>> David Booth
>>>
>>>
>>
>
>
>
>

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Received on Thursday, 26 March 2009 15:43:17 UTC

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