This xsl stylesheet:

<xsl:stylesheet version="1.0" 
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:b="http://b">

<xsl:template match="@b:*"/>

<xsl:template match="*">
  <xsl:copy>
    <xsl:apply-templates select="*|@*"/>
  </xsl:copy>
</xsl:template>

<xsl:template match="@*">
  <xsl:copy/>
</xsl:template>

</xsl:stylesheet>

should strip the attribute b:c out of the following input:

<a b:c="d" xmlns:b="http://b"/>

But instead it produces:

badnsattr$ xsltproc -V test.xsl test.xml
Using libxml 20310 and libxslt 1100
<?xml version="1.0"?>
<a xmlns:b="http://b" b:c="d"/>

Saxon produces:

<?xml version="1.0" encoding="utf-8"?>
<a xmlns:b="http://b"/>

 Steve