[xsl] Can we have a inside a ?

Hey guys,

I've a question: Can we have a <xsl:attribute> inside
a <xsl:variable>?

I'm trying to do something like this: I've to set a
variable depending on a condition that if $var1 is
null or not. If I can directly set the value of var1,
that could have been ideal. Since I cannot reassign
another value to the variable after it was
declared/initialized in XSL, I'm trying to do that
with the following workaround. But I'm not sure if I
can use an <xsl:attribute> with in the <xsl:variable>.
Again if its possible, is there a way that I can
assign the values of $var1 or $var2 to prefix, because
with the following piece, the variable will be just
assigned the word '$var1' or '$var2'.

<xsl:variable name="prefix">
             <xsl:choose>
                <xsl:when test="$var1">
                    <xsl:attribute
name="select">$var1</xsl:attribute>
                </xsl:when>
                <xsl:otherwise>
                    <xsl:attribute
name="select">$var2</xsl:attribute>        
                </xsl:otherwise>
             </xsl:choose>
</xsl:variable>

Thanks in advance,
Bharathi

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