<!-- Experimental params-->
<element name="experimental:params" required="*">
<description>Parameters allow overriding child elements of an included model</description>
<element copy_data="true" required="*">
<description>This is a special element that should not be specified in an SDFormat file. It automatically copies child elements into the SDFormat element so that a plugin can access the data.</description>
</element>
</element> <!-- End Plugin -->