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<!DOCTYPE html>
<html lang="en">
<head>
<link rel="icon" href="/assets/HMCicon-32x32.png"/>
<title>Permanent Identifiers for Digital Assets (PIDA)</title>
<meta name="description" content="Permanent Identifiers for Digital Assets (PIDA)" />
<link rel="stylesheet" type="text/css" href="https://www.helmholtz.de/typo3temp/assets/compressed/merged-5479d28e837a5ddc33e3a039d39af791-3e1b88495c3ae1f90a7bd436a5adf856.css?1645798209" media="all" />
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<div class="skip-nav"><a href="#main" class="skip-nav-btn">Jump directly to the page contents</a></div>
<header class="header header--default">
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<a href="https://purls.helmholtz-metadaten.de/">
<p style="width: 500px;">
<img alt="pida Logo" src="https://raw.githubusercontent.com/Materials-Data-Science-and-Informatics/Logos/main/Pida/Pida_Logo_Text.png" style="float: left; width: 26%; height:26%; " />
</p>
<p style="margin-left: 150px;font-size:26px"> A PID Provider </p>
</a>
</div>
<a href="https://helmholtz-metadaten.de/">
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<span><mark>Home</mark></span>
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<a href="/assets/technicalSpecs.html" class="breadcrumb__link"><span>Technical Specifications</span></a>
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<div class="headline headline--line-left">
<h2 class="headline__heading">PIDA - Persistent Identifiers for Digital Assets
</h2>
</div>
<div class="introtext">
<p>We provide long-lasting references for digital assets accessible to
<br>
humans and machine agents</p>
</div>
<br />
<div class="tcontainer">
<div>
<div class="title" style="float: left;">
<b>News </b>
</div>
<marquee class="ticker-move" scrollamount="10" onmouseover="this.stop();" onmouseout="this.start();">
<div>
<span class="dot"></span> <a href="http://purls.helmholtz-metadaten.de/prima" class="news-bar">Recently registered PURLs: PRovenance Information in MAterials science (PRIMA) ontology.</a>    
<span class="dot"></span> <a href="http://purls.helmholtz-metadaten.de/pldo" class="news-bar">Recently registered PURLs: Planar Defects Ontology (PLDO).</a>    
<span class="dot"></span> <a href="http://purls.helmholtz-metadaten.de/dislockg" class="news-bar">Recently registered PURLs: knowledge graph for crystalline material's dislocation (dislockg).</a>    
<span class="dot"></span> <a href="http://purls.helmholtz-metadaten.de/podo" class="news-bar">Recently registered PURLs: Point Defects Ontology (PODO).</a>    
<span class="dot"></span> <a href="http://purls.helmholtz-metadaten.de/helmholtzkg" class="news-bar">Recently registered PURLs: Helmholtz Knowledge Graph </a>    
<span class="dot"></span> <a href="#" class="news-bar">Coming soon: the persistence checking tool.</a>    
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<div class="textmedia__text">
<p>
PIDA is a service providing unique persistent URLs (PURLs) for referencing digital assets
on the web. Using our service will help you to ensure that your digital assets remain
findable and can be accessed reliably by both humans and machines in the long term.
PIDA is a service offered by the <a href="https://helmholtz-metadaten.de/en" target="_blank">Helmholtz Metadata Collaboration (HMC)</a> and the
<a href="https://fz-juelich.de/ias/ias-9/EN/Home/home_node.html" target="_blank"> Institute for Materials Data Science and Informatics (IAS-9)</a> at Forschungszentrum Jülich.
</p>
<br>
<div>
<video width="820" height="540" title="PIDA promotion video" controls autoplay muted style="border-color: lightslategray; border-width: 2px; border-radius: 10px; border-style: solid;">
<source src="https://github.com/Materials-Data-Science-and-Informatics/Media/blob/main/Pida/Pida_FeaturesPromo.mp4?raw=true" type="video/mp4">
Your browser does not support the video tag.
</video>
</div>
<h4>Why using PIDs from PIDA for your digital assets</h4>
<p class="has-line-data" data-line-start="0" data-line-end="4">
Web addresses and the stability of established links can decay over time – for example,
if a digital resource is moved to another location or when the domain name of an organization
changes. This process is often known as <a href="https://en.wikipedia.org/wiki/Link_rot" target="_blank">link rot</a>.
When users try to access a decayed link, i.e.
where the target has moved to a different location, they receive an ”<a href="https://en.wikipedia.org/wiki/HTTP_404" target="_blank"><code>404 not found</code></a>” error instead
of the desired web page. This problem can be prevented by using persistent identifiers – such as those
provided by PIDA. These long-lasting references to a digital object – such as an article, dataset, video,
person, or organization – will persistently identify that object on the internet, regardless of its actual location.
<br>
<br>
Using a PURL provided by PIDA ensures that:
</p>
<ul>
<li>a resource can be reliably referenced for future access by humans and software</li>
<li>links to resources do not break</li>
<li>resources become more easily discoverable – for example, researchers, their affiliations, and their contributions</li>
<li>resources are findable – one of the key elements in the <a href="https://www.go-fair.org/fair-principles/" target="_blank">FAIR principles</a> of data management</li>
<li>entities can be identified <a href="https://en.wikipedia.org/wiki/Disambiguation_(disambiguation)" target="_blank">unambiguously</a> – for example,
authors with the same name can be distinguished from one another</li>
</ul>
<h4 id="AddingUpdating">How to manage PIDs in PIDA </h4>
<p>Please use one of the following options to add or update your PIDs using our GitHub repository:</p>
<ul>
<li>
<b>Issue tracker</b>: <a href="https://github.com/Materials-Data-Science-and-Informatics/PIDA/issues/new?assignees=saidfathalla&labels=New+PURL&template=request-purl.md&title=%5BNew+PURL%5D" target="_blank">create a new issue</a> (via <em>request PURL</em> issue
template) describing the PURL you want to register.
</li>
<li>
<b>Fork PIDA repository</b>: before using this method, please read the section <a href="/assets/technicalSpecs.html#good-practice">Good practice when submitting requests via pull requests</a>
in the <a href="/assets/technicalSpecs.html">technical specifications</a> page.
<ul style="list-style-type:none;">
<p><b>1.</b> <a href="https://docs.github.com/en/get-started/quickstart/fork-a-repo" target="_blank">Fork</a> the <a href="https://github.com/saidfathalla/pida" target="_blank">PIDA repository</a>.</p>
<p><b>2.</b> prepare your <a href="https://httpd.apache.org/docs/2.4/howto/htaccess.html" target="_blank">.htaccess</a> file
(considering the required information mentioned in the <a href="https://github.com/Materials-Data-Science-and-Informatics/PIDA/issues/new?assignees=saidfathalla&labels=New+PURL&template=request-purl.md&title=%5BNew+PURL%5D" target="_blank">issue template</a>).</p>
<p><b>3.</b> add or update your entries and <a href="https://docs.github.com/en/desktop/contributing-and-collaborating-using-github-desktop/making-changes-in-a-branch/committing-and-reviewing-changes-to-your-project" target="_blank">commit</a> your changes. </p>
<p><b>4.</b> submit a <a href="https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/incorporating-changes-from-a-pull-request/about-pull-request-merges" target="_blank">pull request</a> for your changes.
The maintainers of PIDA will check your pull request and merge it into the main branch so that you can see your purl in our repository.
</p>
</ul>
</li>
</ul>
<br>
<p>
<b>Disclaimer</b>: <i> we do not assess the quality of the artefacts that our PIDs direct to, we only provide the PID.</i>
</p>
<h3>License</h3>
<p>The code is licensed under the <a href="https://github.com/saidfathalla/PIDA/blob/main/LICENSE" target="_blank">MIT license</a>. Copyright © 2022.</p>
<h3>Acknowledgments</h3>
<br />
<p>
PIDA is a service of the <a href=" https://helmholtz-metadaten.de/en" target="_blank">Helmholtz Metadata Collaboration (HMC)</a>, an incubator-platform of the Helmholtz
Association within the framework of the Information and Data Science strategic initiative. It is developed,
maintained and offered to you by the <a href="https://fz-juelich.de/ias/ias-9/EN/Home/home_node.html" target="_blank">Institute for Materials Data Science and Informatics (IAS-9)</a> of the Forschungszentrum Jülich
</p>
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