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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>"OMG Unified Modeling Language (OMG UML), Superstructure. Version 2.4.1". Object Management Group. Retrieved 2013-09-02. <a href="http://www.omg.org/spec/UML/2.4.1" target="_blank">http://www.omg.org/spec/UML/2.4.1</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Unified Modeling Language 2.5.1. OMG Document Number formal/2017-12-05. Object Management Group Standards Development Organization (OMG SDO). December 2017. <a href="https://www.omg.org/spec/UML/2.5.1/PDF" target="_blank">https://www.omg.org/spec/UML/2.5.1/PDF</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> </ol>