xslt Name space problems in xml

Hi, I'm trying to convert an xml document using xslt but have run into a problem: the xml document contains an attribute xmlns in some of it's elements
eg:
<content>
<table>
<selection xmlns="http://www.imsglobal.org/xsd/ims_qtiasiv1p2" id="1"/>
</table>
</content>


My xslt document:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<xsl:output method="xml" encoding="UTF-8"/>
<xsl:template match="/content">
<xsl:for-each select="table">
<check>
<xsl:for-each select="selection"><xsl:value-of select="id"/>
</xsl:for-each>
</check>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>

expected output:
<?xml version="1.0" encoding="UTF-8"?><check xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">1</check>

actual output:
<?xml version="1.0" encoding="UTF-8"?><check xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/>

Is there anything I can do so that the selection element is actually read?

well, someone helped me out again...
I have to declare
xmlns:ims="http://www.imsglobal.org/xsd/ims_qtiasiv1p2" in the beginning, and then use
<xsl:for-each select="ims:selection"></xsl:for-each>