[xsl] using variable in mode attribute

["Long Zhao" <LZhao@xxxxxxxxxxxxxxxx>]

Hi All,

I have the following code which does not work.
if I replace the mode="$BID" with mode="id1" in line 4, it works.
so my question is 
does the mode attribute take a variable?
if it does not, what should I do?
xml:
<A>
	<B ID="id1"/>
</A>
xsl:
	<xsl:template match="A">
		<xsl:for-each select="B">
			<xsl:variable name="BID" select="@ID"/>
			<xsl:apply-templates select="self::B" mode="$BID"/>
		</xsl:for-each>
	</xsl:template>

	<xsl:template match="B" mode="id1">
		whatever
		<xsl:apply-templates select="self::B" mode="table"/>
	</xsl:template>

	<xsl:template match="B" mode="table">
		table
	</xsl:template>

thanks

Long

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