Revision 7648
Added by Aaron Marcuse-Kubitza over 11 years ago
| VegCore.htm | ||
|---|---|---|
| 6 | 6 |
<meta name="description" content="Redmine" /> |
| 7 | 7 |
<meta name="keywords" content="issue,bug,tracker" /> |
| 8 | 8 |
<meta content="authenticity_token" name="csrf-param" /> |
| 9 |
<meta content="6XL3ojOwWNQ0htv8dZx9CYnUtPxNsAGvBLvuaivJefo=" name="csrf-token" />
|
|
| 9 |
<meta content="eNtcHcnpOkN4Wa2v2PxUb/HB+QTLb0hMxjg6JeGzcF4=" name="csrf-token" />
|
|
| 10 | 10 |
<link rel='shortcut icon' href='/nceas/favicon.ico?1347421715' /> |
| 11 | 11 |
<link href="/nceas/stylesheets/jquery/jquery-ui-1.8.21.css?1357775071" media="all" rel="stylesheet" type="text/css" /> |
| 12 | 12 |
<link href="/nceas/stylesheets/application.css?1357775071" media="all" rel="stylesheet" type="text/css" /> |
| ... | ... | |
| 375 | 375 |
|
| 376 | 376 |
|
| 377 | 377 |
<ul> |
| 378 |
<li>An ID should always be <em>globally</em> unique to allow appending data from arbitrary datasets</li> |
|
| 379 |
<li>An ID must <em>permanently</em> and <em>unambiguously</em> identify the record.<br />Domain identifiers are usually permanent, while autogenerated primary keys often aren't.</li> |
|
| 378 |
<li>An ID should always be <em>globally</em> unique to allow appending data from arbitrary datasets.<br />A local ID can be made global by prepending the institution's ID.</li> |
|
| 379 |
<li>An ID must <em>permanently</em> and <em>unambiguously</em> identify the record |
|
| 380 |
<ul> |
|
| 381 |
<li>Domain identifiers are usually permanent, while autogenerated primary keys often aren't.<br />However, domain identifiers are sometimes duplicated, in which case another ID, such as a primary key, must be used to distinguish them.</li> |
|
| 380 | 382 |
</ul> |
| 383 |
</li> |
|
| 384 |
<li>When multiple IDs are available, include all of them (in separate columns) to allow looking up the record by any of them</li> |
|
| 385 |
</ul> |
|
| 381 | 386 |
|
| 382 | 387 |
|
| 388 |
<p style="padding-left:2em;"><em>Note that these globally unique IDs are not the same as <a href="http://en.wikipedia.org/wiki/Globally_unique_identifier" class="external">UUIDs</a>, which are randomly generated</em></p> |
|
| 389 |
|
|
| 390 |
|
|
| 383 | 391 |
<a name="Forming-preferred-IDs"></a> |
| 384 | 392 |
<h3 style="padding-left:1em;">Forming preferred IDs<a href="#Forming-preferred-IDs" class="wiki-anchor">¶</a></h3> |
| 385 | 393 |
|
| 386 | 394 |
|
| 387 | 395 |
<ul> |
| 388 |
<li>The <em>preferred ID</em> is the ID which is most directly associated with the identified object.<br />Choose from ID values in the following order: |
|
| 396 |
<li>Choose one ID to serve as the <em>preferred ID</em>. This becomes the database primary key.</li> |
|
| 397 |
<li>Choose the ID which is most directly associated with the identified object: |
|
| 389 | 398 |
<ol> |
| 390 | 399 |
<li>a domain identifier</li> |
| 391 | 400 |
<li>a permanent URL</li> |
| 392 | 401 |
<li>a <em>permanent</em> primary key</li> |
| 393 | 402 |
</ol> |
| 394 | 403 |
</li> |
| 395 |
<li><em>Within</em> these categories, it should be the <em>shortest</em> string which is globally unique</li>
|
|
| 404 |
<li><em>Within</em> these categories, choose the <em>shortest</em> string which is globally unique</li>
|
|
| 396 | 405 |
</ul> |
| 397 | 406 |
|
| 398 | 407 |
|
Also available in: Unified diff
mappings/VegCore.htm: Regenerated from wiki. Forming IDs: Added instructions for making a local ID global. Added note that these globally unique IDs are not the same as UUIDs. Forming preferred IDs: Reworded as a set of instructions rather than a definition. Clarified that this becomes the database primary key.