What is the significance of setting the doctype in an XML file, specifically in the context of PHP-generated SVG files?

Setting the doctype in an XML file, particularly in PHP-generated SVG files, is important for defining the rules and structure of the document. This ensures that the SVG file is interpreted correctly by browsers and other XML parsers. Without a proper doctype declaration, the SVG file may not render correctly or may encounter parsing errors. 

<?php
header('Content-type: image/svg+xml');
echo '<?xml version="1.0" encoding="UTF-8" standalone="no"?>';
echo '<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">';
echo '<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="100" height="100">';
// SVG content goes here
echo '</svg>';
?>

Keywords

XML doctype PHP SVG significance

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