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<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 in 7 simple steps. The decentralised architecture connects public authorities, so they can exchange evidences (official documents) at the citizen's or business' request.</p>
<p class="lead">The>There citizenis ora businessguidance isdocument identifiedavailable and,that havingprovides activelya confirmedhigh-level thatoverview theyand wishintroduction to the useway the Once-Only Technical System, is shown a list of the 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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<div><p class="text-left"><a class="btn primary" href="#"><span>Download the OOTS Guidance Report</span><span class="ico-download"></span></a></p></div>
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<div><p class="text-right"><a class="btn ghost" href="#"><span>Download the OOTS Guidance Report</span><span class="ico-download"></span></a></p></<div><h3>The 7 steps of the Once-Only Technical System:</h3></div>
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<p class="lead">In technical terms, the exchange is done using the popular digital building block for secure data exchanged called eDelivery. eDelivery is a package of technical specifications based on open standards installable software and ancillary services to allow Member States to create a network of nodes for secure digital data exchange.</p> 
<p class="lead">The authentication mechanism of citizens and businesses is done using the eIDAS eID building block.</p>
<p class="lead">Finally, the European Commission provides several Common Services as part of the Once-Only Technical Architecture.</p>
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<li><div><span>1</span><p><strong>Authenticate: </strong>The user authenticates with an eIDAS notified eID scheme</p></div></li>
<li><div><span>2</span><p><strong>Locate evidence: </strong>The procedure portal identifies what to ask for, (Evidence Type), and who to ask it from (Evidence Provider)</p></div></li>
<li><div><span>3</span><p><strong>Evidence request: </strong>The request for evidence is sent to the Evidence Provider</p></div></li>
<li><div><span>4</span><p><strong>Redirect: </strong>The user is redirected to the provider side</p></div></li>
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<li><div><span>5</span><p><strong>Preview: </strong>The user previews their evidence</p></div></li>
<li><div><span>6</span><p><strong>Evidence response: </strong>The Evidence Provider responds to the evidence request</p></div></li>
<li><div><span>7</span><p><strong>Submit: </strong>The user completes and submits his/her procedural form</p></div></li>
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<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 shown a list of the 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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<div><p class="text-right"><a class="btn 

ghost" 

href="

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

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

p></div>
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img-

fluid" src="https://ec.europa.eu/digital-building-blocks/sites/download/attachments/565379323/diagram-how-does-it-work.png" alt=""></div>
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<p class="

lead"

>In technical 

terms, 

the 

exchange 

is done using the popular digital building block for secure data exchanged called eDelivery. eDelivery is a package of technical specifications based on open standards installable software and ancillary services to allow Member States to create a network of nodes for secure digital data exchange.</p> 
<p class="lead">The authentication mechanism of citizens and businesses is done using the eIDAS eID building block.</p>
<p class="lead">Finally, the European Commission provides several Common Services as part of the Once-Only Technical Architecture.</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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</div>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 4<1</small></p>
<h3 class="h5">Evidence Exchange<>Introduction - High Level <br>Architecture</h3>
<p>This chapter introduces evidence exchange inthe high-level architecture of the Once-Only Technical System, whichand isthe basedkey onconcepts bilateraland datathemes exchangefound in betweenthe relevantsubsequent authoritieschapters.</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/4IUvHQWoUvHQ"><span>View chapter</span><span class="ico-cta"></span></a></p>
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<p><small>Chapter 5<2</small></p>
<h3 class="h5">Data Models<>User Identification, Authentication and Record Matching</h3>
<p>This chapter looksexplains athow thethose datasubmitting modelsor that streamline the exchange of evidences, together with a methodology for defining new data models and code listsreceiving 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/x/T4YvHQmYUvHQ"><span>View chapter</span><span class="ico-cta"></span></a></p>
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<p><small>Chapter 6<3</small></p>
<h3 class="h5">OOTS Guidance & UX <br>Recommendations<>Common Services</h3>
<p>This chapter provideslooks anat overviewthe ofCommon howServices thenecessary Once-Onlyfor Technicalthe Systemproper worksexecution as part of the widerevidence Single Digital Gateway and looks at the first set of UX recommendationsexchange 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/P4CYIvYUvHQ"><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.</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/4IUvHQ"><span>View chapter</span><span class="ico-cta"></span></a></p>
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<p><small>Chapter 

5</small></

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<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>
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<p><img aria-hidden="true" alt="" src<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/ico-article-secondary.svg"></p> 
<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 requestx/T4YvHQ"><span>View chapter</span><span class="ico-cta"></span></a></p>
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<p><small>Chapter 6</small></p>
<h3 class="h5">OOTS Guidance & UX <br>Recommendations</h3>
<p>This chapter provides an overview of how the Once-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><span class="badge sm">In development</span></p>
<p<p>Release date: <strong>October 2022</strong></p> 
<p><a class="opacity-50">Expected release date: <strong>December 2022</strong></p>
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btn primary" target="_blank" href="https://ec.europa.eu/digital-building-blocks/sites/x/P4CYI"><span>View chapter</span><span class="ico-cta"></span></a></p>
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<p class="

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<h2>Common services</h2>

<p class="lead opacity-75">The 

Commission 

provides 

Common 

Services 

to 

help 

the 

Member 

States 

ensure 

the 

proper 

exchange 

of evidences.</p>
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<p><span<div 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>Data Service RepositoryDirectory (SRDSD)</h3>
<p class="opacity-75">The SemanticData Service RepositoryDirectory is a common service that acts as a data portal for the technical systemcatalogue 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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<h2>Supporting services</h2><div class="card-grid">
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<h3 class="h5">Testing service<>Evidence Broker (EB)</h3>

<div<p class="supportingopacity-services-container">
<p>National implementers can test their respective implementations using the test platform. Access a test platform and tools through this (secure) testing service.<br>  
Request access via the  Support Desk directly.</p> 
<p><a class="btn ghost" target="_blank" href="https://ec.europa.eu/digital-building-blocks/sites/x/kwPTI"><span>Go to wiki</span><span class="ico-cta"></span></a><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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<p>Contact the service desk on <a href="mailto:EC-OOTS-SUPPORT@ec.europa.eu" target="_blank">EC-OOTS-SUPPORT@ec.europa.eu</a></p>
<p><a class="btn ghost" target="_blank" href="mailto:EC-OOTS-SUPPORT@ec.europa.eu"><span>Contact via email</span><span class="ico-email"></span></a></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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<h2>Supporting services</h2>
<p><img aria-hidden="

true"

alt="

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src="

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<h3 class="h5">Testing service</h3>

<div class="supporting-services-container">
<p>National implementers can test their respective implementations using the test platform. Access a test platform and tools through this (secure) testing service.<br>  
Request access via the  Support Desk directly.</p> 
<p><a class="btn ghost" target="_blank" href="https://ec.europa.eu/digital-building-blocks/sites/x/kwPTI"><span>Go to wiki</span><span class="ico-cta"></span></a></p>
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<p>Contact the service desk on <a href="mailto:EC-OOTS-SUPPORT@ec.europa.eu" target="_blank">EC-OOTS-SUPPORT@ec.europa.eu</a></p>
<p><a class="btn ghost" target="_blank" href="mailto:EC-OOTS-SUPPORT@ec.europa.eu"><span>Contact via email</span><span class="ico-email"></span></a></p>
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<h2>Collaborate with us</h2>

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<h3 class="h5">Single Digital Gateway Coordination group</h3>
<p class="opacity-75">The gateway coordination group is composed of the national coordinators and chaired by the Commission and has the objective to facilitate the application of the Regulation (EU) No 1024/2012 (adopted 03/10/2018), in particular by exchanging best practices and working together to improve the consistency of the presentation of information as required by this Regulation. This group is only accessible for representatives of the Member States (and other public entities).</p>
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<h3 class="h5">Single Digital Gateway Coordination group<>Sub-groups</h3>
<p class="opacity-75">The gateway coordination group is composed of the national coordinators and chaired by the Commission and has the objective to facilitate the application of the Regulation (EU) No 1024/2012 (adopted 03/10/2018), in particular by exchanging best practices and working together to improve the consistency of the presentation of information as required by this Regulation>Six sub-groups have been set-up to examine specific topics and are expected to report to the gateway coordination group. They enable the participation of all Member States in the discussion and ensure the work done by Member State experts is monitored. The gateway coordination group will review the deliverables of the sub-groups and decide whether to accept them fully, partly, or not. This group is only accessible for representatives of the Member States (and other public entities) only accessible to ….</p>
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<h3 class="h5">Sub-groups</h3>
<p class="opacity-75">Six sub-groups have been set-up to examine specific topics and are expected to report to the gateway coordination group. They enable the participation of all Member States in the discussion and ensure the work done by Member State experts is monitored. The gateway coordination group will review the deliverables of the sub-groups and decide whether to accept them fully, partly, or not. This group is only accessible to ….</p>
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<h2>Service desk</h2>
<p class="lead">This Service Desk helps users improve the performance, continuity and reliability of their Once-Only Technical system implementations.</p>
<p class="service-desk-cta"><a class="btn ghost" target="_blank" href="https://ec.europa.eu/digital-building-blocks/tracker/plugins/servlet/desk/portal/15"><span>Contact the service desk</span><span class="ico-

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#latest-news .news-teaser-root > div > div:last-child button:hover { text-decoration: underline;}

@media screen and (max-width: 768px) {
#latest-news .news-teaser-root > div > div > div  { position:relative !important; width: auto !important; left: auto !important; top: auto !important;}
#latest-news .news-teaser-root .aui-group { min-height: auto !important;}
}

/*hack - remove empty p from confluence*/
#latest-news .container > p:first-child, #latest-news .container > p:last-child { display:none; border:1px solid red;}

/*---COLLABORATE WITH US---*/
#collaborate-with-us { position:relative; z-index: 5; margin-bottom: -16rem; padding-top: 0; padding-bottom: 0; background: linear-gradient(to right, #00284A 0%, #00284A 50%, transparent 50%, transparent 100%);}
#collaborate-with-us .container { padding: 6rem 3rem 6rem 0; background-color: #00284A; border-top-right-radius: 60px; border-bottom-right-radius: 60px;
background-image: url("https://ec.europa.eu/digital-building-blocks/sites/download/attachments/565379323/illu-launch-rocket.png");
background-position:  90% bottom;
background-repeat: no-repeat;
}
#collaborate-with-us h2 { margin-bottom:2.5rem;}
#collaborate-with-us .col-separator-before:before, 
#collaborate-with-us .col-separator-after:after { border-left:1px solid rgba(255, 255, 255, 0.12);}  
#collaborate-with-us .opacity-75 { opacity: 0.75;}
#collaborate-with-us h2, #collaborate-with-us h3, #collaborate-with-us p { color: white;}

/*hack - remove empty p from confluence*/
#collaborate-with-us > p:first-child,  #collaborate-with-us > p:last-child { display:none; border:1px solid red;}

/*---SERVICE DESK---*/
#service-desk { position:relative; z-index: 4; padding-top: 21rem;
background-image: url("https://ec.europa.eu/digital-building-blocks/sites/download/attachments/565379323/bg-illu-sigle-service-desk.svg");
background-position: top right;
background-repeat: no-repeat;
background-size: cover;} 
#service-desk .service-desk-cta { margin-top: 2.5rem; margin-bottom:0;}