Use:
<xsl:template match="y0:YourName" xmlns:y0="http://www.it.ojp.gov/jxdm/3.0">
<xsl:element name="local-name()">
<xsl:apply-templates/>
</xsl:element>
</xsl:template>
probably combined with an identity template so that other elements are copied unchanged.
Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference