A while ago, I published an article on how to use Python’s docutils to expand some markup in reStructuredText into the HTML for a YouTube embedded video. Just for fun, here’s an XSLT stylesheet that does something similar. It hasn’t had a chance to be used in production, but if you have an XSLT-based web application, it might come in useful.
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns="http://www.w3.org/1999/xhtml">
<!-- Replaces elements of thei form <youtube id="asdfasdf" /> with the
correct XHTML object element to embed a YouTube video -->
<!-- If desired, one can also place arbitrary elements inside the youtube
element that will be converted into parameters of the object element.
E.g. the element <fullscreen>true</fullscreen> will be converted to
<param name="fullscreen" value="true" /> -->
<xsl:strip-space elements="youtube"/>
<xsl:template match="youtube">
<xsl:element name="object">
<xsl:attribute name="type">application/x-shockwave-flash</xsl:attribute>
<xsl:attribute name="width">425</xsl:attribute>
<xsl:attribute name="height">344</xsl:attribute>
<xsl:attribute name="class">youtube-embed</xsl:attribute>
<xsl:attribute name="data">
http://www.youtube.com/v/<xsl:value-of select="@id"/>
</xsl:attribute>
<xsl:element name="param">
<xsl:attribute name="name">movie</xsl:attribute>
<xsl:attribute name="value">
http://www.youtube.com/v/<xsl:value-of select="@id"/>
</xsl:attribute>
</xsl:element>
<xsl:element name="param">
<xsl:attribute name="name">wmode</xsl:attribute>
<xsl:attribute name="value">transparent</xsl:attribute>
</xsl:element>
<xsl:apply-templates mode="youtube-params" />
</xsl:element>
</xsl:template>
<xsl:template match="youtube/*" mode="youtube-params">
<xsl:element name="param">
<xsl:attribute name="name"><xsl:value-of select="local-name()" /></xsl:attribute>
<xsl:attribute name="value"><xsl:value-of select="text()" /></xsl:attribute>
</xsl:element>
</xsl:template>
</xsl:stylesheet>
As the comment notes, you need to run this on an XML document that contains elements like <youtube id="asdfasdf" />. It’s not currently configurable as to the width, height, and other parameters (except by changing the XSLT) but could be made so.