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<center><h1>Darwin Core Namespace Policy</h1><center>
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<table cellspacing="0" class="docinfo">
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<tbody>
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<tr>
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<th>Title:</th>
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<td>Darwin Core Namespace Policy</td>
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</tr>
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<tr>
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<th>Date Issued:</th>
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<td>2009-02-12</td>
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</tr>
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<tr>
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<th>Date Modified:</th>
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<td>2015-06-02</td>
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</tr>
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<tr>
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<th>Abstract:</th>
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<td>All terms in the Darwin Core must be assigned a unique
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Uniform Resource Identifier (URI). For convenience, the term
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URIs that are assigned and managed by the Darwin Core Task
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Group are grouped into collections known as Darwin Core
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namespaces. This document describes how term URIs are allocated
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by the Darwin Core Task Group and the policies associated with
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Darwin Core namespaces.</td>
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</tr>
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<tr>
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<th>Contributors:</th>
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<td>John Wieczorek (MVZ), Markus Döring (GBIF), Renato De
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Giovanni (CRIA), Tim Robertson (GBIF), Dave Vieglais
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(KUNHM)</td>
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</tr>
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<tr>
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<th>Legal:</th>
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<td>This document is governed by the standard legal, copyright,
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licensing provisions and disclaimers issued by the Taxonomic
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Databases Working Group.</td>
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</tr>
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<tr>
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<th>Part of TDWG Standard:</th>
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<td>
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<a href=
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"http://www.tdwg.org/standards/450/">http://www.tdwg.org/standards/450/</a>
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</td>
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</tr>
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<tr>
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<th>Creator:</th>
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<td>Darwin Core Task Group</td>
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</tr>
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<tr>
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<th>Identifier:</th>
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<td>http://rs.tdwg.org/dwc/2014-11-08/terms/namespace/</td>
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</tr>
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<tr>
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<th>Latest Version:</th>
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<td>
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<a href=
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"http://rs.tdwg.org/dwc/terms/namespace/index.htm">http://rs.tdwg.org/dwc/terms/namespace/</a>
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</td>
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</tr>
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<tr>
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<th>Replaces:</th>
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<td>
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<a href=
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"http://rs.tdwg.org/dwc/2013-09-23/terms/namespace/index.htm">
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http://rs.tdwg.org/dwc/2013-09-23/terms/namespace/</a>
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</td>
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</tr>
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<tr>
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<th>Document Status:</th>
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<td>Current Standard</td>
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</tr>
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</tbody>
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</table><br>
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<br>
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</td>
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</tr>
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</tbody>
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</table><a id="introduction" name="introduction"></a>
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<h2>1. Introduction</h2><b>Audience</b>: This document is targeted toward
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those who want to make changes to the Darwin Core, either by refining terms
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that already exist or by adding new terms to increase the capabilities of the
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standard.
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<p>This document and the policies contained herein are modeled on the
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<i>Dublin Core Metadata Initiative Namespace Policy</i> [<a href=
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"http://dublincore.org/documents/2007/07/02/dcmi-namespace/">DCMINAMESPACEPOLICY</a>].
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All terms in the Darwin Core must be identified with a unique Uniform
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Resource Identifier (URI). For convenience, the term URIs are grouped into
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collections known as <i>Darwin Core namespaces</i>. This document describes
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the policies associated with Darwin Core namespaces and how term URIs are
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allocated by the <i>Darwin Core Task Group</i> [<a href=
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"http://www.tdwg.org/activities/darwincore/">DWC-TASK</a>]. <a id=
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"namespaceuris" name="namespaceuris"></a></p>
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<h2>2. Namespace URIs</h2>
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<p>The Darwin Core namespace URI for the collection of all Darwin Core
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properties, classes, and encoding schemes is:</p>
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<pre class="example">
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http://rs.tdwg.org/dwc/terms/
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</pre>
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<p>The term identifier for the current (recommended) version of a term is a
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URI based on the namespace and the term name without version information.
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Some example Darwin Core term identifiers follow:</p>
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<pre class="example">
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http://rs.tdwg.org/dwc/terms/scientificName
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</pre>
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<p>is the Darwin Core term identifier for the <i>scientificName</i> property,
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while</p>
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<pre class="example">
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http://rs.tdwg.org/dwc/terms/MachineObservation
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</pre>
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<p>is the Darwin Core term identifier for the <i>MachineObservation</i>
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class.</p>
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<p>All Darwin Core identifiers will dereference to a Darwin Core term
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declaration for the identified term. <a id="classesofchanges" name=
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"classesofchanges"></a></p>
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<h2>3. Term Change Policy</h2>
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<p>Changes to Darwin Core recommendations or term declarations will occur
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from time to time for a variety of reasons. Changes have varying implications
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for the decision making process and for versioning Darwin Core documents and
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term URIs. The types of changes and appropriate processes are identified and
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explained in the following sections.</p>
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<p><b>Reporting issues</b>: In all cases the proposed change should be
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reported to the <i>Technical Architecture Group</i> [<a href=
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"mailto:tdwg-tag@lists.tdwg.org">TDWG-TAG</a>] and the outcome of the
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proposal should be announced on the <i>Darwin Core mailing list</i> [<a href=
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"http://lists.tdwg.org/mailman/listinfo/tdwg-content">TDWG-CONTENT</a>].</p>
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<p><b>Decisions</b>: In cases where an Executive decision is required,the
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<i>Technical Architecture Group</i> will conduct a minimum 30-day public
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comment period on the <i>Darwin Core mailing list</i> [<a href=
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"http://lists.tdwg.org/mailman/listinfo/tdwg-content">TDWG-CONTENT</a>],
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during which the proposal can be refined based on discussion in an effort to
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reach consensus (no dissenting opinion expressed publicly on the mailing list
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for 30 days from the most recent iteration). If a consensus is reached, the
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proposal will be presented by the <i>Technical Architecture Group</i> to the
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Executive Committee for a decision [<a href=
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"../history/decisions/index.htm">DECISIONS</a>] within 30 days.</p>
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<p><b>Versions</b>: In cases where a decision requires a version change, the
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attributes <i>Status</i> (recommended, superseded, or deprecated), <i>Date
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Issued</i>, <i>Date Modified</i>, <i>Decision</i>, <i>Version</i>,
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<i>Replaces</i>, and <i>Is Replaced By</i> will be modified in the affected
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terms as appropriate.</p>
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<h3>3.1. Minor editorial errata</h3>
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<p>An error in spelling, punctuation, grammar, or other clerical mistake
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discovered in a Darwin Core recommendation or term declaration may be
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corrected without a public comment period or Executive Decision. Minor
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editorial changes of this type do not require a version change for the
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affected term and/or documents.</p>
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<h3>3.2. Substantive editorial errata</h3>
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<p>A substantive error is one that compromises the usefulness or accuracy of
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systems based on Darwin Core. Those that are unequivocal (for example, an
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incorrect URI or reference) may be treated as minor editorial errata (Section
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3.1).</p>
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<p>Otherwise, the <i>Technical Architecture Group</i> will conduct a public
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comment period and seek an Executive decision to find a solution that
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minimizes adverse effects on existing applications. Changes of this nature
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require a version change for the affected term and/or documents.</p>
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<h3>3.3. Semantic changes to Darwin Core terms</h3>
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<p>Darwin Core terms may be changed based on public demand and consensus. A
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request to the <i>Technical Architecture Group</i> for a term change should
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consist of proposed values for the complete list of attributes given in the
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term definitions section of the <i>Darwin Core Terms Complete History</i>
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[<a href="../history/index.htm">HISTORY</a>] along with a statement of
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justification for the change.</p>
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<p>Term changes that are likely to have substantial functional impact on
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human understanding or machine processing will posted for public commentary
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and an Executive decision. Changes of this nature require a version change
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for the affected term and/or documents.</p>
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<h3>3.4. Addition of Darwin Core terms</h3>
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<p>New terms may be added to the Darwin Core namespaces based on public
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demand and consensus. A request to the <i>Technical Architecture Group</i>
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[<a href="mailto:tdwg-tag@lists.tdwg.org">TDWG-TAG</a>] for a new term should
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consist of proposed values for the complete list of attributes given in the
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term definitions section of the <i>Darwin Core Terms Complete History</i>
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[<a href="../history/index.htm">HISTORY</a>] along with a statement of
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justification for the new term, including an explanation of why no existing
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term will suffice.</p>
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<p>New term proposals will be posted for public commentary and an Executive
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decision. Changes of this nature require a version change for the affected
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term and/or documents. <a id="persistence" name="persistence"></a></p>
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<h2>4. Persistence Policy</h2>
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<p>TDWG recognizes that people and applications depend on the persistence of
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formal documents and machine processable schemas that have been made publicly
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available. In particular, the stability of Darwin Core term URIs and Darwin
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Core namespace URIs is critical to interoperability over time. Thus, the wide
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promulgation of this set of URIs dictates that they be maintained to support
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legacy applications that have adopted them.</p>
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