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        Installation
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        First Start
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        User Interface
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        Overview
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        Schema Requirements
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        Geometric Requirements
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        Semantic Requirements
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        MULTI_SURFACE
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<a class="md-nav__link" href="#terms-and-definitions">
    Terms and definitions
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<h1 id="validation-of-3d-city-models-encoded-in-citygml">Validation of 3D city models encoded in CityGML<a class="headerlink" href="#validation-of-3d-city-models-encoded-in-citygml" title="Permanent link">#</a></h1>
<h2 id="terms-and-definitions">Terms and definitions<a class="headerlink" href="#terms-and-definitions" title="Permanent link">#</a></h2>
<p>as defined in <a href="http://mail.opengeospatial.org/lists/lt.php?id=fR4CDVYeAlJfHwhTCwA">CityGML Quality Interoperability Experiment, chapter 3</a></p>
<p><strong>Validation</strong></p>
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<p>Process of validating a CityGML data set against a specified set of requirements. A valid data set is conformant to these requirements.</p>
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<p><strong>Requirements</strong></p>
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<p>Rules and restrictions to define data structure and content unambiguously. Requirements can be derived from the CityGML Standard document or be defined separately as refinement of the CityGML standard to avoid ambiguities of the standard and/or specify further requirements (user/application dependent).</p>
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<p><strong>Check</strong></p>
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<p>Algorithmic implementation to check if a requirement is met in a validation software. </p>
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<p><strong>Error</strong></p>
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<p>Result of a check in case of non-conformance.</p>
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<p><strong>Validation plan</strong></p>
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<p>Structured list of requirements, usually depending on use case.</p>
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<h3 id="additional-defintions">Additional defintions<a class="headerlink" href="#additional-defintions" title="Permanent link">#</a></h3>
<p><strong>XSD valid</strong></p>
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<p>A CityGML is conform to the schema or XSD valid if it validates against the CityGML XML schema.</p>
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