<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Georgia;
panose-1:2 4 5 2 5 4 5 2 3 3;}
@font-face
{font-family:Consolas;
panose-1:2 11 6 9 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
p
{mso-style-priority:99;
mso-margin-top-alt:auto;
margin-right:0in;
mso-margin-bottom-alt:auto;
margin-left:0in;
font-size:12.0pt;
font-family:"Times New Roman",serif;}
pre
{mso-style-priority:99;
mso-style-link:"HTML Preformatted Char";
margin:0in;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Courier New";}
p.msonormal0, li.msonormal0, div.msonormal0
{mso-style-name:msonormal;
mso-style-priority:99;
mso-margin-top-alt:auto;
margin-right:0in;
mso-margin-bottom-alt:auto;
margin-left:0in;
font-size:12.0pt;
font-family:"Times New Roman",serif;}
span.EmailStyle19
{mso-style-type:personal;
font-family:"Arial",sans-serif;
color:black;}
span.HTMLPreformattedChar
{mso-style-name:"HTML Preformatted Char";
mso-style-priority:99;
mso-style-link:"HTML Preformatted";
font-family:Consolas;}
span.EmailStyle22
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-US" link="#0563C1" vlink="#954F72">
<div class="WordSection1">
<p class="MsoNormal"><span style="color:#1F497D">Teresa,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">If you migrated from Archivist Toolkit and preserved those AT-generated ref_IDs in ASpace during the migration (e.g.
</span>ref118_up1)<span style="color:#1F497D">, it’s likely that you’ll run into a few dupes. My understanding is that the migration appended the underscore and those three extra characters to the original AT ref_ids, but in some cases that strategy was not
sufficient to guarantee uniqueness, especially if you have a sizable number of archival objects if your database. We have definitely encountered this problem when using ref_IDs outside of the system as you describe. We were storing the ref_ids in our repository
and using them to auto-generate digital objects in ASpace and link those objects to their corresponding archival object. We noticed the duplicate ref_ID problem when digital objects were being linked to archival objects in the wrong resource.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">ASpace <i>does</i> enforce uniqueness of ref_IDs within a given resource record, but not across resources.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">-Noah<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Georgia",serif;color:#404040"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Georgia",serif;color:#1F497D">================<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Georgia",serif;color:#1F497D">Noah Huffman<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Georgia",serif;color:#1F497D">Archivist for Metadata, Systems, and Digital Records<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Georgia",serif;color:#1F497D">David M. Rubenstein Rare Book & Manuscript Library<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Georgia",serif;color:#1F497D">Duke University | 919-660-5982<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Georgia",serif;color:#1F497D"><a href="http://library.duke.edu/rubenstein/"><span style="color:#1F497D">http://library.duke.edu/rubenstein/</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Georgia",serif;color:#1F497D">Pronouns:</span><span style="color:#1F497D">
</span><span style="font-size:10.0pt;font-family:"Georgia",serif;color:#1F497D">he / him / his<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> archivesspace_users_group-bounces@lyralists.lyrasis.org <archivesspace_users_group-bounces@lyralists.lyrasis.org>
<b>On Behalf Of </b>Andrew Morrison<br>
<b>Sent:</b> Friday, March 6, 2020 6:26 AM<br>
<b>To:</b> Archivesspace Users Group <archivesspace_users_group@lyralists.lyrasis.org><br>
<b>Subject:</b> Re: [Archivesspace_Users_Group] Are ASpace-created ref IDs unique?<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif">The ref ID, when not imported or migrated from another source, is generated here:<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><a href="https://urldefense.com/v3/__https:/github.com/archivesspace/archivesspace/blob/master/backend/app/model/archival_object.rb*L42__;Iw!!OToaGQ!9l4ZQb3xRJpRnfEmgSHdiehBiEfOe-Piv5D60mNlkeaLT_WnI1xZGscorsgRt-yKtJdk$">https://github.com/archivesspace/archivesspace/blob/master/backend/app/model/archival_object.rb#L42</a><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif">It is a 32-character hexadecimal string, therefore 16^32 permutations. Uniqueness cannot be guaranteed, but duplicates are very unlikely.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif">Andrew.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif">On Fri, 2020-03-06 at 01:00 +0000, Teresa Soleau wrote:<o:p></o:p></span></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p>All,<o:p></o:p></p>
<p>We are considering using the component ref IDs in ASpace as a unique ID outside of the system (to link up with our digitized collections and other metadata repos). However, we're not sure that they are unique across all resources in our instance of ASpace.
We found some cases where two different archival object had the same ref ID. They are of the type that migrated in from Archivist's Toolkit (example: ref118_up1) so it may be a legacy issue, but I wanted to confirm with someone who knows that the ASpace created
ref IDs are going to be unique across our whole instance of ASpace.<o:p></o:p></p>
<p>Thanks, <br>
~Teresa<o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;color:#1A47B8">Teresa Soleau<br>
</span></b><span style="font-size:9.0pt;color:#1A47B8">Digital Preservation & Library Systems Manager<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;color:#1A47B8">Collection & Content Management Systems<b><br>
</b>The J. Paul Getty Trust <b><br>
</b>T (310) 440 7601 | <a href="https://urldefense.com/v3/__http:/www.getty.edu/__;!!OToaGQ!9l4ZQb3xRJpRnfEmgSHdiehBiEfOe-Piv5D60mNlkeaLT_WnI1xZGscorsgRt0EFbfkC$">
<span style="color:#1A47B8;text-decoration:none">getty.edu</span></a><b><o:p></o:p></b></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;color:#1A47B8"><br>
</span><span style="font-size:9.0pt;color:#1A47B8"><img border="0" width="78" height="31" style="width:.8125in;height:.3229in" id="Picture_x0020_5" src="cid:image001.png@01D5F397.E95A7B10" alt="../../Getty_Logo_EmailSig.png"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Times New Roman",serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Times New Roman",serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Times New Roman",serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
<p><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Archivesspace_Users_Group mailing list<o:p></o:p></pre>
<pre><a href="mailto:Archivesspace_Users_Group@lyralists.lyrasis.org">Archivesspace_Users_Group@lyralists.lyrasis.org</a><o:p></o:p></pre>
<pre><a href="https://urldefense.com/v3/__http:/lyralists.lyrasis.org/mailman/listinfo/archivesspace_users_group__;!!OToaGQ!9l4ZQb3xRJpRnfEmgSHdiehBiEfOe-Piv5D60mNlkeaLT_WnI1xZGscorsgRt3QN6_Km$">http://lyralists.lyrasis.org/mailman/listinfo/archivesspace_users_group</a><o:p></o:p></pre>
</blockquote>
</div>
</body>
</html>