Source of: /manual/en/xml.case-folding.php
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<div>
<h1>Case Folding</h1>
<p class="para">
The element handler functions may get their element names
<span class="glossterm">case-folded</span>. Case-folding is defined
as "a process applied to a sequence of
characters, in which those identified as non-uppercase are
replaced by their uppercase equivalents". In other words, when
it comes to XML, case-folding simply means uppercasing.
</p>
<p class="para">
By default, all the element names that are passed to the handler
functions are case-folded. This behaviour can be queried and
controlled per XML parser with the
<a href="function.xml-parser-get-option.php" class="function">xml_parser_get_option()</a> and
<a href="function.xml-parser-set-option.php" class="function">xml_parser_set_option()</a> functions,
respectively.
</p>
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