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To add a DOCTYPE declaration to a WAM, use the xsl:output element. For example:

     <xsl:output method="xml" omit-xml-declaration="yes" encoding="UTF-8"
           indent="no" doctype-public="-//W3C//DTD XHTML 1.0 Strict//EN"
           doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd" />

To avoid conflict between the different weblets and the main webroutine XSL, we recommend you define your DOCTYPE declaration in your layout weblet only.

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As some devices might look for the simplified DOCTYPE to detect if the document is HTML5, the WAM runtime outputs the simplified HTML5 DOCTYPE if the xsl:output uses the XSL-friendly legacy-compat DOCTYPE:

     <xsl:output method="xml" omit-xml-declaration="yes" encoding="UTF-8" 
           indent="no" doctype-system="about:legacy-compat" />