[xsl] please help me

when i run this code
<?xml version="1.0" encoding="UTF-8" ?>
<stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:template match="/"></xsl:template>
</stylesheet>
iget this eror:' xsl' is an undeclared namespace.

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