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In the specific case of RDF, having your cake and eating it doesn't
work. Paste this:<br>
<br>
<rdf:RDF xmlns:rdf=<a class="moz-txt-link-rfc2396E" href="http://www.w3.org/1999/02/22-rdf-syntax-ns#">"http://www.w3.org/1999/02/22-rdf-syntax-ns#"</a><br>
xmlns:dwc=<a class="moz-txt-link-rfc2396E" href="http://rs.tdwg.org/dwc/terms/">"http://rs.tdwg.org/dwc/terms/"</a><br>
><br>
<dwc:Occurrence
rdf:about=<a class="moz-txt-link-rfc2396E" href="http://herbarium.org/hb123456">"http://herbarium.org/hb123456"</a>> <br>
<dwc:recordedBy
rdf:resource=<a class="moz-txt-link-rfc2396E" href="http://people.vanderbilt.edu/~steve.baskauf/foaf.rdf#me">"http://people.vanderbilt.edu/~steve.baskauf/foaf.rdf#me"</a>>Steve
Baskauf</dwc:recordedBy><br>
</dwc:Occurrence><br>
</rdf:RDF><br>
<br>
into the W3C RDF validator at:<br>
<a class="moz-txt-link-freetext" href="http://www.w3.org/RDF/Validator/">http://www.w3.org/RDF/Validator/</a><br>
and it will tell you "The attributes on this property element, are not
permitted with any content; expecting end element tag.". So in RDF
elements having the rdf:resource attribute have to be empty elements.
I tried validating an example where the recordedBy property was
included twice, once with a URI object and once with a string literal
object. It validated as "good" RDF, but I think it would be confusing
to a linked data client that would really have no clue that both
objects represented the same thing and would probably "assume" that the
occurrence was recorded by two entities rather than one.. <br>
<br>
A possible solution would be to use dcterms:description as another
attribute. dcterms:description is defined as "An account of the
resource. Description may include ...a free-text account of the
resource." I couldn't find a more appropriate Dublin Core to use as an
attribute. So running this example:<br>
<br>
<rdf:RDF xmlns:rdf=<a class="moz-txt-link-rfc2396E" href="http://www.w3.org/1999/02/22-rdf-syntax-ns#">"http://www.w3.org/1999/02/22-rdf-syntax-ns#"</a><br>
xmlns:dcterms=<a class="moz-txt-link-rfc2396E" href="http://purl.org/dc/terms/">"http://purl.org/dc/terms/"</a><br>
xmlns:dwc=<a class="moz-txt-link-rfc2396E" href="http://rs.tdwg.org/dwc/terms/">"http://rs.tdwg.org/dwc/terms/"</a><br>
><br>
<dwc:Occurrence
rdf:about=<a class="moz-txt-link-rfc2396E" href="http://herbarium.org/hb123456">"http://herbarium.org/hb123456"</a>> <br>
<dwc:recordedBy
rdf:resource=<a class="moz-txt-link-rfc2396E" href="http://people.vanderbilt.edu/~steve.baskauf/foaf.rdf#me">"http://people.vanderbilt.edu/~steve.baskauf/foaf.rdf#me"</a>
dcterms:description="Steve Baskauf" /><br>
</dwc:Occurrence><br>
</rdf:RDF><br>
<br>
through the validator shows that this RDF asserts the following triples:<br>
<a class="moz-txt-link-freetext" href="http://herbarium.org/hb123456">http://herbarium.org/hb123456</a> dwc:recordedBy
<a class="moz-txt-link-freetext" href="http://people.vanderbilt.edu/~steve.baskauf/foaf.rdf#me">http://people.vanderbilt.edu/~steve.baskauf/foaf.rdf#me</a><br>
and that <br>
<a class="moz-txt-link-freetext" href="http://people.vanderbilt.edu/~steve.baskauf/foaf.rdf#me">http://people.vanderbilt.edu/~steve.baskauf/foaf.rdf#me</a>
dcterms:description "Steve Baskauf"<br>
<br>
In other words, the occurrence was recorded by me (identified by my
URI) and that the description of the thing represented by my URI is
"Steve Baskauf". That is pretty much a correct representation of the
situation, although the whole point of using a URI as the object of a
property is for a client to dereference the URI to find out more about
the object. The FOAF file (pointed to by the URI) would provide that
information without the dcterms:description attribute.<br>
<br>
Steve<br>
<br>
<br>
Jim Croft wrote:
<blockquote
cite="mid:AANLkTilH3t5oHM1Vfq5IJF0_ewtdxkAt8Rb0ZgxuqpvT@mail.gmail.com"
type="cite">
<pre wrap="">wondering if
<dwc:recordedBy
rdf:resource=<a class="moz-txt-link-rfc2396E" href="http://people.vanderbilt.edu/~steve.baskauf/foaf.rdf#me">"http://people.vanderbilt.edu/~steve.baskauf/foaf.rdf#me"</a>>Steve
Baskauf</dwc:recordedBy>
is legit?
just a have your cake and eat it kinda guy...
jim
On Thu, May 20, 2010 at 7:41 AM, Kevin Richards
<a class="moz-txt-link-rfc2396E" href="mailto:RichardsK@landcareresearch.co.nz"><RichardsK@landcareresearch.co.nz></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">From my understanding (and after reading the example Bob referred to), the difference is:
[referring to external id]
<dwc:recordedBy rdf:resource=<a class="moz-txt-link-rfc2396E" href="http://people.vanderbilt.edu/~steve.baskauf/foaf.rdf#me">"http://people.vanderbilt.edu/~steve.baskauf/foaf.rdf#me"</a> />
[inline text]
<dwc:recordedBy>Steve Baskauf</dwc:recordedBy>
Look right?
Kevin
-----Original Message-----
From: <a class="moz-txt-link-abbreviated" href="mailto:tdwg-tag-bounces@lists.tdwg.org">tdwg-tag-bounces@lists.tdwg.org</a> [<a class="moz-txt-link-freetext" href="mailto:tdwg-tag-bounces@lists.tdwg.org">mailto:tdwg-tag-bounces@lists.tdwg.org</a>] On Behalf Of Jim Croft
Sent: Thursday, 20 May 2010 9:37 a.m.
To: Bob Morris
Cc: <a class="moz-txt-link-abbreviated" href="mailto:tdwg-tag@lists.tdwg.org">tdwg-tag@lists.tdwg.org</a>
Subject: Re: [tdwg-tag] string literals vs. uris for dwc:recordedBy, dwc:identifiedBy, and dwc:georeferencedBy in RDF
Hi Bob - should the same term allow both types of content, or should
there be a different term for each? Does it matter? Should
applications be smart enough to tell the difference and know what to
do with it?
Not really asking what the specification says, but about purity and
wholesomeness of design... :)
jim
On Thu, May 20, 2010 at 4:26 AM, Bob Morris <a class="moz-txt-link-rfc2396E" href="mailto:morris.bob@gmail.com"><morris.bob@gmail.com></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Exactly this example is given in
<a class="moz-txt-link-freetext" href="http://web4.w3.org/TR/REC-rdf-syntax/#section-Syntax-property-attributes">http://web4.w3.org/TR/REC-rdf-syntax/#section-Syntax-property-attributes</a>
so I would find it regrettable if DwC does something somewhere that
makes this substitution impossible or discouraged, or encourages tool
construction that does so, or encourages documention be interpreted in
a way that does so.
Indeed <a class="moz-txt-link-freetext" href="http://rs.tdwg.org/dwc/rdf/dwcterms.rdf">http://rs.tdwg.org/dwc/rdf/dwcterms.rdf</a> defines its type to be
rdf:Property and is silent on any semantics but that. My own
conclusion is that neither the intent or the outcome of the rdf
version of dwcterms discourages what you want, though I suppose the
intent part would be clearer if the documentation also said that a URI
can always be used, but applications are responsible for interpreting
it.
On Wed, May 19, 2010 at 11:09 AM, Steve Baskauf
<a class="moz-txt-link-rfc2396E" href="mailto:steve.baskauf@vanderbilt.edu"><steve.baskauf@vanderbilt.edu></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">The definition for the Darwin Core term recordedBy
<a class="moz-txt-link-freetext" href="http://rs.tdwg.org/dwc/terms/index.htm#recordedBy">http://rs.tdwg.org/dwc/terms/index.htm#recordedBy</a>
says "A list (concatenated and separated) of names ...". The examples
given are string literals. However, when using this term as a predicate
in RDF, it would seem preferable to use a URI to an RDF representation
of the entity (if one exists) rather than a string literal. For
example, can I use:
<dwc:recordedBy
rdf:resource=<a class="moz-txt-link-rfc2396E" href="http://people.vanderbilt.edu/~steve.baskauf/foaf.rdf#me">"http://people.vanderbilt.edu/~steve.baskauf/foaf.rdf#me"</a>/>
rather than
<dwc:recordedBy>Steven J. Baskauf</dwc:recordedBy>
?
Steve Baskauf
--
Steven J. Baskauf, Ph.D., Senior Lecturer
Vanderbilt University Dept. of Biological Sciences
postal mail address:
VU Station B 351634
Nashville, TN 37235-1634, U.S.A.
delivery address:
2125 Stevenson Center
1161 21st Ave., S.
Nashville, TN 37235
office: 2128 Stevenson Center
phone: (615) 343-4582, fax: (615) 343-6707
<a class="moz-txt-link-freetext" href="http://bioimages.vanderbilt.edu">http://bioimages.vanderbilt.edu</a>
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</pre>
</blockquote>
<pre wrap="">
--
Robert A. Morris
Emeritus Professor of Computer Science
UMASS-Boston
100 Morrissey Blvd
Boston, MA 02125-3390
Associate, Harvard University Herbaria
email: <a class="moz-txt-link-abbreviated" href="mailto:ram@cs.umb.edu">ram@cs.umb.edu</a>
web: <a class="moz-txt-link-freetext" href="http://bdei.cs.umb.edu/">http://bdei.cs.umb.edu/</a>
web: <a class="moz-txt-link-freetext" href="http://etaxonomy.org/FilteredPush">http://etaxonomy.org/FilteredPush</a>
<a class="moz-txt-link-freetext" href="http://www.cs.umb.edu/~ram">http://www.cs.umb.edu/~ram</a>
phone (+1)617 287 6466
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</pre>
</blockquote>
<pre wrap="">
--
_________________
Jim Croft ~ <a class="moz-txt-link-abbreviated" href="mailto:jim.croft@gmail.com">jim.croft@gmail.com</a> ~ +61-2-62509499 ~
<a class="moz-txt-link-freetext" href="http://www.google.com/profiles/jim.croft">http://www.google.com/profiles/jim.croft</a>
'A civilized society is one which tolerates eccentricity to the point
of doubtful sanity.'
- Robert Frost, poet (1874-1963)
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</pre>
</blockquote>
<pre wrap=""><!---->
</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Steven J. Baskauf, Ph.D., Senior Lecturer
Vanderbilt University Dept. of Biological Sciences
postal mail address:
VU Station B 351634
Nashville, TN 37235-1634, U.S.A.
delivery address:
2125 Stevenson Center
1161 21st Ave., S.
Nashville, TN 37235
office: 2128 Stevenson Center
phone: (615) 343-4582, fax: (615) 343-6707
<a class="moz-txt-link-freetext" href="http://bioimages.vanderbilt.edu">http://bioimages.vanderbilt.edu</a>
</pre>
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