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<h2>Who is the Once-Only Hub for?</h2>
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<p><strong>Implementers from EU Member States</strong>, building and maintaining the Once-Only Technical System. A single environment providing them with information and access to services.</p>
<p><strong>Anyone</strong> can browse the Hub to learn more about the system, program and the benefits for them. </p>
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<p class="lead">The technical and operational specifications

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 of the Once-Only Technical

System</h2> <p class="lead">The Once-Only Technical System (OOTS) is a technical framework for data sharing. Citizens and businesses will be able to request official documents (known as “evidence”) to complete administrative procedures allowing people to study, work, live and retire in other EU countries. The decentralised architecture connects public authorities, so they can exchange evidences (official documents) at the citizen's request.</p> <p class="lead">The citizen or business is identified and, having actively confirmed that they wish to use

 System, laid down in the Commission’s Implementing Regulation ((EU) 2022/1463) setting out the system, are complemented by detailed, non-binding technical design documents jointly prepared by the Commission and Member States.</p>

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<p><small>Chapter 1</small></p>
<h3 class="h5">Introduction - High Level Architecture</h3>
<p>This chapter introduces the high-level architecture of the Once-Only Technical System

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is shown a list of

and the

types

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concepts

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and

that

themes

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found

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to

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be retrieved directly from data sources abroad. The citizen will then select which documents they wish to retrieve from the data sources.<

subsequent chapters.</p>
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<p>Release date: <strong>October 2022</strong></p>
<p><a class="btn primary" target="_blank" href="https://ec.europa.eu/digital-building-blocks/sites/x/WoUvHQ"><span>View chapter</span><span class="ico-cta"></span></a></p>
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<p><small>Chapter 2</small></p>
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href="#"><span>Download the OOTS Guidance Report</span><span class="ico-download"></span></a></p></div>

>User Identification, Authentication and Record Matching</h3>
<p>This chapter explains how those submitting or receiving evidences through the Once-Only Technical System are identified and authenticated.</p>
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<p>Release date: <strong>October 2022</strong></p> 
<p><a class="btn primary" target="_blank" href="https://ec.europa.eu/digital-building-blocks/sites/

download/attachments/565379323/diagram-how-does-it-work.png" alt=""></div> </div>

x/mYUvHQ"><span>View chapter</span><span class="ico-cta"></span></a></p>
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<p<div class="lead">The technical and operational specifications of the Once-Only Technical System, laid down in the Commission’s Implementing Regulation ((EU) 2022/1463) setting out the system, are complemented by detailed, non-binding technical design documents jointly prepared by the Commission and Member States.</p>

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<p><small>Chapter 3</small></p>
<h3 class="h5">Common Services</h3>
<p>This chapter looks at the Common Services (provided by the Commission) necessary for the proper execution of the evidence exchange process.</p>
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<p>Release date: <strong>October 2022</strong></p> 
<p><a class="btn primary" target="_blank" href="https://ec.europa.eu/digital-building-blocks/sites/x/vYUvHQ"><span>View chapter</span><span class="ico-cta"></span></a></p>
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<p><small>Chapter 1<4</small></p>
<h3 class="h5">Introduction - High Level Architecture<>Evidence Exchange</h3>
<p>This chapter introduces theevidence high-level architecture ofexchange in the Once-Only Technical System, andwhich theis keybased conceptson andbilateral themesdata foundexchange inbetween therelevant subsequent chaptersauthorities.</p>
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<p>Release date: <strong>October 2022</strong></p>
<p><a class="btn primary" target="_blank" href="https://ec.europa.eu/digital-building-blocks/sites/x/WoUvHQ4IUvHQ"><span>View chapter</span><span class="ico-cta"></span></a></p>
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<p><small>Chapter 2<5</small></p>
<h3 class="h5">User Identification, Authentication and Record Matching<>Data Models</h3>
<p>This chapter explains how those submitting or receiving evidences through the Once-Only Technical System are identified and authenticated looks at the data models that streamline the exchange of evidences, together with a methodology for defining new data models and code lists.</p>
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<p>Release date: <strong>October 2022</strong></p> 
<p><a class="btn primary" target="_blank" href="https://ec.europa.eu/digital-building-blocks/sites/x/mYUvHQT4YvHQ"><span>View chapter</span><span class="ico-cta"></span></a></p>
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<p><small>Chapter 3<6</small></p>
<h3 class="h5">Common Services<>OOTS Guidance & UX Recommendations</h3>
<p>This chapter looks at provides an overview of how the Common Services (provided by the Commission) necessary for the proper execution of the evidence exchange processOnce-Only Technical System works as part of the wider Single Digital Gateway and looks at the first set of UX recommendations.</p>
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<p>Release date: <strong>October 2022</strong></p> 
<p><a class="btn primary" target="_blank" href="https://ec.europa.eu/digital-building-blocks/sites/x/vYUvHQ"><span>View chapter</span><span class="ico-cta"></span></a></p>
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<p><small>Chapter 4</small></p>
<h3 class="h5">Evidence Exchange</h3>
<p>This chapter introduces evidence exchange in the Once-Only Technical System, which is based on bilateral data exchange between relevant authorities.<eu/digital-building-blocks/sites/x/P4CYI"><span>View chapter</span><span class="ico-cta"></span></a></p>
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<p>Release date: <strong>October 2022</strong></p>
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<p><a class="btn primaryghost" target="_blank" href="https://ec.europa.eu/digital-building-blocks/sites/x/4IUvHQPQF1Fg"><span>View chapter< all latest chapter releases</span><span class="ico-cta"></span></a></p>
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<div class="

card-grid-body"> <p><small>Chapter 5</small></p> <h3 class="h5">Data Models</h3> <p>This chapter looks at the data models that streamline the exchange of evidences, together with a methodology for defining new data models and code lists.</p> </div> <div class="card-grid-footer"> <p>Release date: <strong>October 2022</strong></p> <p><a class="btn primary" target="_blank" href="https://ec.europa.eu/digital-building-blocks/sites/x/T4YvHQ"><span>View chapter</span><span class="ico-cta"></span></a></p> </div> </div><div class="card-grid"> <div class="card-grid-body"> <p><small>Chapter 6</small></p> <h3 class="h5">OOTS Guidance & UX Recommendations</h3> <p>This chapter provides an overview of how

col-9">
<h2>Architectural design of the Once-Only Technical System</h2>
<p class="lead">The Once-Only Technical System (OOTS) is a technical framework for data sharing. Citizens and businesses will be able to request official documents (known as “evidence”) to complete administrative procedures allowing people to study, work, live and retire in other EU countries. The decentralised architecture connects public authorities, so they can exchange evidences (official documents) at the citizen's request.</p>
<p class="lead">The citizen or business is identified and, having actively confirmed that they wish to use the Once-Only Technical System, is

works

shown

as

part

list of the

wider Single Digital Gateway and looks at the first set of UX recommendations

 types of document that are possible to be retrieved directly from data sources abroad. The citizen will then select which documents they wish to retrieve from the data sources.</p>
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<p>Release date: <strong>October 2022</strong></p> <p><a

<div><p class="

btn primary" target="_blank

text-right"><a class="btn ghost" href="

https://ec.europa.eu/digital-building-blocks/sites/x/P4CYI"><span>View chapter<

#"><span>Download the OOTS Guidance Report</span><span class="ico-

cta

download"></span></a></

p> <

p></div>
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<div><img class="img-fluid" src="https://ec.europa.eu/digital-building-blocks/sites/download/

x/PQF1Fg"><span>View all latest chapter releases</span><span class="ico-cta"></span></a></p>

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<h2>Common services</h2> <p class="lead opacity-75">The Commission provides the following Common Services to allow for the proper exchange of evidences.</p>

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<h3 class="h5">Data Service Directory (DSD)</h3>
<p class="opacity-75">The Data Service Directory is a common service that acts as a catalogue of evidence types that can be provided upon request.</p>
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<p><span class="badge sm">In development</span></p>
<p class="opacity-50">Expected release date: <strong>December 2022</strong></p>
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<h3 class="h5">Evidence Broker (EB)</h3>
<p class="opacity-75">The Evidence Broker is an authoritative system that maps specific data sets as evidence types that prove specific requirements.  </p>
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<p><span class="badge sm">In development</span></p> 
<p class="opacity-50">Expected release date: <strong>December 2022</strong></p>
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<h3 class="h5">Semantic Repository (SR)</h3>
<p class="opacity-75">The Semantic Repository is a common service that acts as a data portal for the technical system.</p>
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<p><span class="badge sm">In development</span></p> 
<p class="opacity-50">Expected release date: <strong>December 2022</strong></p>
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