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Hi Rod,<br>
<br>
>>>From the meeting report - which I am struggling to get back to - these
two bullet points sum it up I think<br>
<p class="MsoBodyText" style="margin-left: 36pt; text-indent: -18pt;"><!--[if !supportLists]--><span
style="font-family: Symbol;" lang="EN-GB"><span style="">·<span
style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span><!--[endif]--><span lang="EN-GB">There are certain
things for
which LSIDs are not appropriate. It would be legal to use them for RDF
resource
identifiers for controlled vocabularies and XML Schema locations BUT we
would
have to extend existing software libraries to do this which is not
desirable.</span></p>
<p class="MsoBodyText" style="margin-left: 36pt; text-indent: -18pt;"><!--[if !supportLists]--><span
style="font-family: Symbol;" lang="EN-GB"><span style="">·<span
style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span><!--[endif]--><b style=""><span lang="EN-GB">Recommendation:</span></b><span
lang="EN-GB"> LSIDs are not used for
controlled vocabularies, ontologies or XML Schema locations. LSIDs
should be
used to refer to instances.</span></p>
Basically it was felt that if we used LSIDs for things like rdfs:Class
definitions then any library that went off to fetch the definitions
automatically would have to be extended so that it understood LSID
resolution. On the other hand it was felt that use of LSIDs for real
resources (things we are actually describing like specimens and people)
was fine. Once an ontology is loaded then it is all fine though so to
an extent this may be a false problem.<br>
<br>
We spent a long time talking about what is part of the ontology and
what isn't and went round in circles (please lets not do it again).
Basically class and property descriptions should be URL type URIs but
instance URIs can be LSIDs. If you want to define the genus <i>Rhododendron</i>
as being an OWL DL class retrieved remotely then you should probably
give it a URL. If you want to define it as a data item then use a LSID.<br>
<br>
I think Gregor's worries (correct me if I am wrong Gregor) are that in
SDD (possibly our whole domain) many things could be considered classes
and properties. i.e. Things you want your reasoner to use in the
reasoning rather than simply reason about. In this case it may be
better to have URLs for everything.<br>
<br>
There is a niggling doubt (in my mind) that we may come across 'cool'
tools and libraries that assume that <b>all </b>resource URIs are
URLs and that we would not be able to use them or would need to extend
them if we use LSIDs. Imagine a semantic web browser where you click on
a node and it fetches the associated resource to expand itself. <br>
<br>
I do occasionally struggle to see the advantages of LSIDs as GUIDs over
just conventions for use of URLs but these may be matters of personal
faith. Another bullet point in the report says:<br>
<p class="MsoBodyText" style="margin-left: 36pt; text-indent: -18pt;"><!--[if !supportLists]--><span
style="font-size: 10pt; font-family: Symbol;" lang="EN-GB"><span
style="">·<span
style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span><!--[endif]--><b style=""><span lang="EN-GB">Recommendation:
</span></b><span lang="EN-GB">GUIDs Group should issue
a document clearly justifying adoption of GUID technology. The
advantages need
to be clearly explained.</span></p>
I'll try and get this report out ASAP but it looks very similar to the
wiki page here:<br>
<br>
<a class="moz-txt-link-freetext" href="http://wiki.tdwg.org/twiki/bin/view/TAG/TagMeeting1ReportDraft">http://wiki.tdwg.org/twiki/bin/view/TAG/TagMeeting1ReportDraft</a><br>
<br>
Obviously would be grateful for your thoughts. <br>
<br>
Roger<br>
<br>
<br>
<br>
Roderic Page wrote:
<blockquote cite="mida5d044f636516c58be9f1bcff70850e7@bio.gla.ac.uk"
type="cite">
<pre wrap="">Dear Gregor,
For the benefit of those not at TAG 1, can you please explain why
"LSIDs are not interoperable with semantic web technologies"?
Regards
Rod
On 2 May 2006, at 16:44, Gregor Hagedorn wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Note that part of my concern about the use of concept when talking
about
classes/properties/data elements is that I more and more believe we
will want
to use ontology reasoners for uses other than software design, i.e. as
part of
what we currently consider data (taxon names, concepts, rank
hierarchy, parts
of organisms, properties of organisms, etc.). All these are ontological
concepts, and efforts <a class="moz-txt-link-abbreviated" href="http://www.plantontology.org">www.plantontology.org</a> do use OWL to reason on
them.
The SDD presentation (the one not held in EDI, attached) contained some
examples how we might want to query our data - in ways that
OWL-for-software-
design seems not to cover - and which using LSIDs would even prevent.
Please discuss:
<a class="moz-txt-link-freetext" href="http://wiki.tdwg.org/twiki/bin/view/TAG/WhyWeShouldNotUseLSIDs">http://wiki.tdwg.org/twiki/bin/view/TAG/WhyWeShouldNotUseLSIDs</a>
<a class="moz-txt-link-freetext" href="http://wiki.tdwg.org/twiki/bin/view/TAG/UsePURLsAsGUIDs">http://wiki.tdwg.org/twiki/bin/view/TAG/UsePURLsAsGUIDs</a>
Gregor
----------------------------------------------------------
Gregor Hagedorn (<a class="moz-txt-link-abbreviated" href="mailto:G.Hagedorn@bba.de">G.Hagedorn@bba.de</a>)
Institute for Plant Virology, Microbiology, and Biosafety
Federal Research Center for Agriculture and Forestry (BBA)
Königin-Luise-Str. 19 Tel: +49-30-8304-2220
14195 Berlin, Germany Fax: +49-30-8304-2203
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<pre wrap=""><!---->------------------------------------------------------------------------
----------------------------------------
Professor Roderic D. M. Page
Editor, Systematic Biology
DEEB, IBLS
Graham Kerr Building
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United Kingdom
Phone: +44 141 330 4778
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email: <a class="moz-txt-link-abbreviated" href="mailto:r.page@bio.gla.ac.uk">r.page@bio.gla.ac.uk</a>
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reprints: <a class="moz-txt-link-freetext" href="http://taxonomy.zoology.gla.ac.uk/rod/pubs.html">http://taxonomy.zoology.gla.ac.uk/rod/pubs.html</a>
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</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
-------------------------------------
Roger Hyam
Technical Architect
Taxonomic Databases Working Group
-------------------------------------
<a class="moz-txt-link-freetext" href="http://www.tdwg.org">http://www.tdwg.org</a>
<a class="moz-txt-link-abbreviated" href="mailto:roger@tdwg.org">roger@tdwg.org</a>
+44 1578 722782
-------------------------------------
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