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<h1><span class="d-block text-primary">The Once Only Hub.</span>span>Collaborate Collaborate to build the future firstof EUthe DataSingle Space.<Market</h1>
<p>The OnceEU Onlyis Technicalmaking Systemit (OOTS)easier isfor thecitizens firstto EU cross-domain data space for secure government-to-government data exchange.</p>
<p>To make OOTS a reality, the European Commission established the Once Only Hub (OOHUB), a space for implementors where they can discover and access all the services provided by the European Commission to implement the Once Only Technical System.study, move, work, retire or do business.
The Once-Only Technical System will connect EU public authorities, so they can exchange official documents and data at the citizen’s request. It puts into practice the Once-Only Principle (OOP), which states that citizens should not be forced to provide information to authorities if another authority already holds that information in electronic format.</p>

<h3 class="h4">SDG coordination group</h3> 
<p>Responsible<p>Actors responsible for building and maintaining the <strong>implementationOnce-Only ofTechnical OOTS</strong>System inbetween theirMember member stateStates.</p>

<h3 class="h4">Competent authorities</h3> 
<p>The authorities whichwho must <strong>allowallow their users to retrieve requested evidence</strong>evidence using OOTSthe  Once-Only Technical System.</p>

<h3 class="h4">Solution>Interested providers<parties</h3> 
<p>Lorem<p>Everyone ipsumwho dolorwants sitto amet,learn consecteturmore adipiscingabout elit, sed do eiusmod tempor incididuntthe Once-Only Technical System.</p>

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<p><small>Chapter 1</small></p>
<h3 class="h5">Introduction - High Level Architecture</h3>
<p>This chapter providesintroduces athe high-level overview of the architecture of the Once-Only Technical System (OOTS) of the Single Digital Gateway (SDG) and serves as an introduction to all technical design documents of the OOTS and the key concepts and themes found in the subsequent chapters.</p>
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<p>Release date: <strong>October 2022</strong></p>
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<p><small>Chapter 2</small></p>
<h3 class="h5">User Identification, Authentication and Record Matching</h3>
<p>This chapter deepdives into explains how evidence requesters or evidence provider  are identified and authenticated when performing  a procedure using the OOTS to exchange evidence. This chapter looks at the use and purpose of the eID Building Block and eIDAS attributes in the Once-Only Technical SystemOOTS to support user identification and authentication.</p>
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<p>Release date: <strong>October 2022</strong></p> 
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<p><small>Chapter 3</small></p>
<h3 class="h5">Common services</h3>
<p>This chapter provides looks at those Common Services identified by the informationMember modelStates and technical documentation European Commission necessary for the proper execution of the identifiedevidence Commonexchange Services,process whichwithin are thethe OOTS:<br>
- Data Service Directory, the(DSD)
- Evidence Broker and the (EB)
- Semantic Repository (SR).</p>
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<p>Release date: <strong>October 2022</strong></p> 
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<p><small>Chapter 4</small></p>
<h3 class="h5">Evidence Exchange</h3>
<p>This chapter describes correlated messages and how the Once-Only Technical System (OOTS) specifications define in detail the structure, content and message exchange parameters.</p>
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<p>Release date: <strong>October 2022</strong></p>
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<p><small>Chapter 5</small></p>
<h3 class="h5">Data Models</h3>
<p>This chapter has coveres the semantic interoperability issues in designing the single technical system for the SDG and ensuring its interconnection with EU Member States' IT systems and EU-level systems.</p>
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<p>Release date: <strong>October 2022</strong></p> 
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<p><small>Chapter 6</small></p>
<h3 class="h5">OOTS Guidance & UX Recommendations</h3>
<p>This chapter provides a high-level overview of how the Once-Only Technical System (OOTS) of the Single Digital Gateway (SDG) works as well as detailed UX recommendations.</p>
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<p>Release date: <strong>October 2022</strong></p> 
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