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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I don’t think any URNs work with typical semantic web tools do they? Ie they don’t know how to resolve them.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Kevin<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> tdwg-content-bounces@lists.tdwg.org [mailto:tdwg-content-bounces@lists.tdwg.org]
<b>On Behalf Of </b>Paul Murray<br>
<b>Sent:</b> Thursday, 9 June 2011 2:56 p.m.<br>
<b>To:</b> Steve Baskauf<br>
<b>Cc:</b> tdwg-content@lists.tdwg.org<br>
<b>Subject:</b> Re: [tdwg-content] Why UUIDs alone are not adequate as GUIDs, was Re: ITIS TSNID to uBio NamebankIDs mapping [SEC=UNCLASSIFIED]<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On 08/06/2011, at 8:05 AM, Steve Baskauf wrote:<o:p></o:p></p>
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<pre>... I think it's foolish to regard all of these different<o:p></o:p></pre>
<pre>resolution mechanisms as distinct "identifiers". There is *ONE* GUID. It<o:p></o:p></pre>
<pre>is: A9F435E0-8ED7-46DD-BAB4-EA8E5BF41523. There are ten different ways to<o:p></o:p></pre>
<pre>make it actionable. It therefore meets the recommendations of the<o:p></o:p></pre>
<pre>applicability statement.<o:p></o:p></pre>
<p class="MsoNormal">The problem is that when you create an HTTP URI out of a UUID, you are creating an identifier whether you think you are or not. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Jumping in again, but perhaps RFC 4122 might help a little here.</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span class="apple-style-span"><span style="font-family:"Arial","sans-serif"">A GUID (or UUID) is a set of 128 bits, 16 octets, 32 hex digits, 5 inches of punched paper tape. However you choose to write or express it, there is indeed "*ONE*
GUID".</span></span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">A URI is not a GUID. This:</span><o:p></o:p></p>
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<p class="MsoNormal"><span class="apple-tab-span"><span style="font-family:"Arial","sans-serif"">
</span></span><span style="font-family:"Arial","sans-serif""><a href="http://example.org/">http://example.org/</a><span class="apple-style-span">A9F435E0-8ED7-46DD-BAB4-EA8E5BF41523</span></span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span class="apple-style-span"><span style="font-family:"Arial","sans-serif"">is a different URI to this</span></span><o:p></o:p></p>
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<p class="MsoNormal"><span class="apple-tab-span"><span style="font-family:"Arial","sans-serif"">
</span></span><span style="font-family:"Arial","sans-serif""><a href="http://my.organisation.org/">http://my.organisation.org/</a><span class="apple-style-span">A9F435E0-8ED7-46DD-BAB4-EA8E5BF41523</span></span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Arial","sans-serif""><br>
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<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">is a different URI to this:</span><o:p></o:p></p>
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<p class="MsoNormal"><span class="apple-tab-span"><span style="font-family:"Arial","sans-serif"">
</span></span><span style="font-family:"Arial","sans-serif""><a href="http://example.org/">http://example.org/</a><span class="apple-style-span">A9F435E08ED746DDBAB4EA8E5BF41523</span></span><o:p></o:p></p>
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<p class="MsoNormal"><span class="apple-style-span"><span style="font-family:"Arial","sans-serif"">Furthermore, these uris have nothing whatever to do with the guid - apart from the fact that it's obvious to we humans that they do.</span></span><o:p></o:p></p>
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<p class="MsoNormal"><span class="apple-style-span"><span style="font-family:"Arial","sans-serif"">Fortunately, there is a standard for expressing a guid/uuid as a URI, and it is the "uuid" urn namespace, defined in RFC-4122. Thus:</span></span><o:p></o:p></p>
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<p class="MsoNormal"><span class="apple-tab-span"><span style="font-family:"Arial","sans-serif"">
</span></span><span class="apple-style-span"><span style="font-family:"Arial","sans-serif"">urn:uuid:A9F435E0-8ED7-46DD-BAB4-EA8E5BF41523</span></span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Arial","sans-serif""><br>
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<p class="MsoNormal"><span class="apple-style-span"><span style="font-family:"Arial","sans-serif"">is a URI that - according to a w3c standard - corresponds to the 128-bit guid. This:</span></span><o:p></o:p></p>
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<p class="MsoNormal"><span class="apple-tab-span"><span style="font-family:"Arial","sans-serif"">
</span></span><span class="apple-style-span"><span style="font-family:"Arial","sans-serif"">urn:uuid:A9F435E08ED746DDBAB4EA8E5BF41523</span></span><span style="font-family:"Helvetica","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="apple-style-span"><span style="font-family:"Arial","sans-serif"">is *not valid* - it doesn't conform to the schema. There is one unique (case insensitive) uuid urn for any guid, and a defined equivalence between them. These
are not "cool uris", but guids are inherently uncool so that's to be expected.</span></span><span style="font-family:"Helvetica","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="apple-style-span"><span style="font-family:"Arial","sans-serif"">If you want to use GUIDs for identifiers and need equivalent URIs (for use in RDF and the semweb), then urn:uuid:<the guid> might be a good way to go.</span></span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Arial","sans-serif""><br>
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