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<p><small>Chapter<p><small class="text-secondary">Chapter 1</small></p>
<h3 class="h5">Introduction - High Level Architecture</h3>
<p>This chapter provides a 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.</p>
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<p><small>Chapter<p><small class="text-secondary">Chapter 2</small></p>
<h3 class="h5">User Identification, Authentication and Record Matching</h3>
<p>This chapter deepdives into the use and purpose of the eID Building Block and eIDAS attributes in the Once-Only Technical System to support user identification and authentication.</p>
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<p><small>Chapter<p><small class="text-secondary">Chapter 3</small></p>
<h3 class="h5">Common services</h3>
<p>This chapter provides the information model and technical documentation of the identified Common Services, which are the Data Service Directory, the Evidence Broker and the Semantic Repository.</p>
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<p><small>Chapter<p><small class="text-secondary">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><small>Chapter<p><small class="text-secondary">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><small>Chapter<p><small class="text-secondary">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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