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RE: operating and survival conditions

From: Simon Cox <simon.cox@jrc.ec.europa.eu>
Date: Wed, 23 Jun 2010 14:59:01 +0200
To: <Michael.Compton@csiro.au>, <public-xg-ssn@w3.org>
Message-ID: <A7F34A644BEE4537A0DD7DBB5D55AB00@H07.jrc.it>
What is the rationale behind URLs like

http://purl.oclc.org/NET/muo/ucum/unit/temperature/degree-Celsius ?

1.  It appears that the project that set this up stopped in 2008
2.  It doesn't appear to offer any real semantic value - the RDF seems to be
confined to rdf:type information, which doesn't get you far. No definitions,
conversions, or even links to more authoritative definitions. 
3.  The slash URI ultimately maps to a # URI, which implies a finite set in
a primary-resource, which is not scalable for an unbounded set like units of
measure. (Compare this with the OGC URI scheme, which allows any terminal
symbol that can be constructed following the UCUM algorithm - i.e. it
effectively delegates the detail to UCUM. )
4.  I'm a bit baffled why they call it 'ucum' but then do *not* use the
symbols defined in UCUM

I fully agree that an authoritative source of URIs for units and quantities
is required, but submit that this is a poor choice. 

--------------------------------------------------------
Simon Cox

European Commission, Joint Research Centre 
Institute for Environment and Sustainability 
Spatial Data Infrastructures Unit, TP 262 
Via E. Fermi, 2749, I-21027 Ispra (VA), Italy 
Tel: +39 0332 78 3652 
Fax: +39 0332 78 6325 
mailto:simon.cox@jrc.ec.europa.eu 
http://ies.jrc.ec.europa.eu/simon-cox 

SDI Unit: http://sdi.jrc.ec.europa.eu/ 
IES Institute: http://ies.jrc.ec.europa.eu/ 
JRC: http://www.jrc.ec.europa.eu/
--------------------------------------------------------
 
Any opinions expressed are personal unless otherwise indicated. 

-----Original Message-----
From: public-xg-ssn-request@w3.org [mailto:public-xg-ssn-request@w3.org] On
Behalf Of Michael.Compton@csiro.au
Sent: Tuesday, 22 June 2010 15:00
To: public-xg-ssn@w3.org
Subject: operating and survival conditions

I've marked up Payam's suggestion for operating and survival conditions into
an OWL file (as an extension of the current version of the ontology).  See
http://www.w3.org/2005/Incubator/ssn/wiki/Operating_Model

I hope I've interpreted it properly.  All comments welcome - Payam, if you
see anything amiss let me know.

On the same page is an example that encodes the operating and survival
conditions for a sensor.

Both files are attached here.

Michael
Received on Wednesday, 23 June 2010 12:59:44 GMT

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