i'm using saxon 9 to output xhtml files with the following instruction :

<xsl:output name="xhtml" method="xhtml" indent="yes" include-content-type="yes" doctype-public="'-//W3C//DTD XHTML 1.1//EN' 'http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd'" encoding="UTF-8" byte-order-mark="no" omit-xml-declaration="no" standalone="omit" media-type="application/xhtml+xml"/>
 
however no doctype is writen on the output files.

what did i misunderstood ?

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yvon