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<section id="sotd">

<aside class="ednote">
<!--aside class="ednote">
<p>This section will be updated to cover DCAT3 work in a later draft</p>
</aside>
</aside-->

<p>
This document defines a major revision of the DCAT 2 vocabulary ([[?vocab-dcat-2]]) in response to use cases, requirements and community experience which could not considered during the previous vocabulary development. This revision extends the original DCAT standard in line with community practice while supporting diverse approaches to data description and dataset exchange. The main changes to the DCAT vocabulary have been:
</p>
<ul>
<li>addition of <a href="#Property:distribution_checksum"><code>spdx:checksum</code></a> property to link digest for DCAT distributions</li>
<li>addition of <a href="#Property:resource_version"><code>dcat:version</code></a>, <a href="#Property:resource_previous_version"><code>dcat:version</code></a>, <a href="#Property:resource_has_current_version"><code>dcat:hasCurrentVersion</code></a> properties for supporting versioning </li>
<li>addition of a <a href="#Class:Dataset_Series"><code>dcat:DatasetSeries</code></a> class for representing Dataset Series</li>
<li>addition of guidelines for the use of inverse properties <a href="#inverse-properties"></a></li>
<li>addition of <a href="#Property:distribution_checksum"><code>spdx:checksum</code></a> property and <a href="#Class:Checksum"><code>spdx:Checksum</code></a> class to provide digest for DCAT distributions</li>
<li>addition of properties for supporting versioning, e.g., <a href="#Property:resource_version"><code>dcat:version</code></a>, <a href="#Property:resource_previous_version"><code>dcat:version</code></a>, <a href="#Property:resource_has_current_version"><code>dcat:hasCurrentVersion</code></a>, see <a href="#dataset-versions"></a></li>
<li>addition of a <a href="#Class:Dataset_Series"><code>dcat:DatasetSeries</code></a> class and properties for representing Dataset Series, see <a href="#dataset-series"></a></li>
</ul>


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<h2>Motivation for change</h2>

<aside class="ednote">
<!--aside class="ednote">
<p>This section will be updated to cover DCAT3 work in a later draft</p>
</aside>
</aside-->

<p>The original Recommendation [[?VOCAB-DCAT-20140116]] published in January 2014 provided the basic framework for describing datasets. It made an important distinction between a <i>dataset</i> as an abstract idea and a <i>distribution</i> as a manifestation of the dataset. Although DCAT has been widely adopted, it has become clear that the original specification lacked a number of essential features that were added either through the mechanism of a profile, such as the European Commission's DCAT-AP [[?DCAT-AP]], or the development of larger vocabularies that to a greater or lesser extent built upon the base standard, such as the Healthcare and Life Sciences Community Profile [[?HCLS-Dataset]], the Data Tag Suite [[?DATS]] and more. DCAT 2 was developed to address the specific shortcomings that have come to light through the experiences of different communities, the aim being to improve interoperability between the outputs of these larger vocabularies.
<p>The original Recommendation [[?VOCAB-DCAT-20140116]] published in January 2014 provided the basic framework for describing datasets. It made an important distinction between a <i>dataset</i> as an abstract idea and a <i>distribution</i> as a manifestation of the dataset. Although DCAT has been widely adopted, it has become clear that the original specification lacked a number of essential features that were added either through the mechanism of a profile, such as the European Commission's DCAT-AP [[?DCAT-AP]], or the development of larger vocabularies that to a greater or lesser extent built upon the base standard, such as the Healthcare and Life Sciences Community Profile [[?HCLS-Dataset]], the Data Tag Suite [[?DATS]] and more. DCAT 2 [[?VOCAB-DCAT-2]] was developed to address the specific shortcomings that have come to light through the experiences of different communities, the aim being to improve interoperability between the outputs of these larger vocabularies.
For example, in DCAT 2 provided classes, properties and guidance to address <a href="#dereferenceable-identifiers">identifiers</a>, <a href="#quality-information">dataset quality information</a>, and <a href="#data-citation">data citation</a> issues.</p>
<p>This revision, DCAT 3, updates the specification throughout. Significant changes from the 2014 Recommendation and DCAT 2 are marked within the text using "Note" sections, as well as being described in <a href="#changes"></a>.</p>

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