doc/guide/localhost/SXML

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  22 <a href="./Home">MLton 20180207</a>
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  26 <h1>SXML</h1>
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  28 <div id="content">
  29 <div id="preamble">
  30 <div class="sectionbody">
  31 <div class="paragraph"><p><a href="SXML">SXML</a> is an <a href="IntermediateLanguage">IntermediateLanguage</a>, translated from <a href="XML">XML</a> by
  32 <a href="Monomorphise">Monomorphise</a>, optimized by <a href="SXMLSimplify">SXMLSimplify</a>, and translated by
  33 <a href="ClosureConvert">ClosureConvert</a> to <a href="SSA">SSA</a>.</p></div>
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  35 </div>
  36 <div class="sect1">
  37 <h2 id="_description">Description</h2>
  38 <div class="sectionbody">
  39 <div class="paragraph"><p>SXML is a simply-typed version of <a href="XML">XML</a>.</p></div>
  40 </div>
  41 </div>
  42 <div class="sect1">
  43 <h2 id="_implementation">Implementation</h2>
  44 <div class="sectionbody">
  45 <div class="ulist"><ul>
  46 <li>
  47 <p>
  48 <a href="https://github.com/MLton/mlton/blob/master/mlton/xml/sxml.sig"><span class="monospaced">sxml.sig</span></a>
  49 </p>
  50 </li>
  51 <li>
  52 <p>
  53 <a href="https://github.com/MLton/mlton/blob/master/mlton/xml/sxml.fun"><span class="monospaced">sxml.fun</span></a>
  54 </p>
  55 </li>
  56 <li>
  57 <p>
  58 <a href="https://github.com/MLton/mlton/blob/master/mlton/xml/sxml-tree.sig"><span class="monospaced">sxml-tree.sig</span></a>
  59 </p>
  60 </li>
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  64 <div class="sect1">
  65 <h2 id="_type_checking">Type Checking</h2>
  66 <div class="sectionbody">
  67 <div class="paragraph"><p><a href="SXML">SXML</a> shares the type checker for <a href="XML">XML</a>.</p></div>
  68 </div>
  69 </div>
  70 <div class="sect1">
  71 <h2 id="_details_and_notes">Details and Notes</h2>
  72 <div class="sectionbody">
  73 <div class="paragraph"><p>There are only two differences between <a href="XML">XML</a> and <a href="SXML">SXML</a>.  First,
  74 <a href="SXML">SXML</a> <span class="monospaced">val</span>, <span class="monospaced">fun</span>, and <span class="monospaced">datatype</span> declarations always have an
  75 empty list of type variables.  Second, <a href="SXML">SXML</a> variable references
  76 always have an empty list of type arguments.  Constructors uses can
  77 only have a nonempty list of type arguments if the constructor is a
  78 primitive.</p></div>
  79 <div class="paragraph"><p>Although we could rely on the type system to enforce these constraints
  80 by parameterizing the <a href="XML">XML</a> signature, <a href="StephenWeeks">StephenWeeks</a> did so in a
  81 previous version of the compiler, and the software engineering gains
  82 were not worth the effort.</p></div>
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