{{ define "title" }}XSLT & Saxon Error Reference — common errors explained with fixes | {{ .Site.Title }}{{ end }}
{{ define "main" }}
<div class="page-header">
  <h1>XSLT &amp; Saxon Error Reference</h1>
  <p class="lead">The most common XSLT and Saxon error codes and parser messages, explained in plain English: what each error means, what typically causes it, and how to fix it — with before/after examples you can verify in the <a href="https://xsltplayground.com/">online XSLT editor</a>.</p>
</div>

<div class="content ref-intro">
  <p>Saxon error codes follow the W3C convention: <strong>XPST</strong> (XPath static), <strong>XPDY</strong> (XPath dynamic), <strong>XPTY</strong> (XPath type), <strong>XTSE</strong> (XSLT static), <strong>XTDE</strong> (XSLT dynamic), <strong>FO*</strong> (function library). Parser messages such as <em>"Content is not allowed in prolog"</em> come from the underlying XML parser and mean the input is not well-formed XML. Also see the <a href="/xslt/functions/">XSLT &amp; XPath function reference</a>.</p>
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