embed tag for http://wicket.apache.org/dtds.data/wicket-xhtml1.4-strict.dtd

i take a warning for embed tag in my html file. this is the only warning in my project It could be better if embed was defined in the dtd too

<embed wicket:id="embedSrc" src="deneme.smil" width="320" height="240"
loop="true" type='audio/x-pn-realaudio-plugin' controls='imagewindow' console='video' autostart="true" />

unknown tag embed says the eclipse, checking the dtd.