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<div class="section" id="useful-xml-syntax">
<span id="referenceusefulxmlsyntax"></span><h1>Useful XML Syntax<a class="headerlink" href="#useful-xml-syntax" title="Permalink to this headline">ΒΆ</a></h1>
<p>Standard XML placeholders can be used to simplify some scripts. For example, the following (abbreviated) code ensures that the limits of a domain are symmetric.</p>
<div class="highlight-xmds2"><div class="highlight"><pre><span class="cp"><?xml version="1.0" encoding="UTF-8"?></span>
<span class="cp"><!DOCTYPE simulation [</span>
<span class="cp"><!ENTITY Npts "64"></span>
<span class="cp"><!ENTITY L "3.0e-5"></span>
]>
<span class="nt"><simulation</span> <span class="na">xmds-version=</span><span class="s">"2"</span><span class="nt">></span>
. . .
<span class="nt"><geometry></span>
<span class="nt"><propagation_dimension></span> t <span class="nt"></propagation_dimension></span>
<span class="nt"><transverse_dimensions></span>
<span class="nt"><dimension</span> <span class="na">name=</span><span class="s">"x"</span> <span class="na">lattice=</span><span class="s">"&Npts;"</span> <span class="na">domain=</span><span class="s">"(-&L;, &L;)"</span> <span class="nt">/></span>
<span class="nt"></transverse_dimensions></span>
<span class="nt"></geometry></span>
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