How to assign a nodelist to a variable

Hi all....

I need to do something like:

<xsl:value-of select="ROW[field1 = 'A' and field2 = 'B']/f1" />
<xsl:value-of select="ROW[field1 = 'A' and field2 = 'B']/f2" />
<xsl:value-of select="ROW[field1 = 'A' and field2 = 'B']/f3" />

Since I need to call ROW[field1 = 'A' and field2 = 'B'] repeteadly, I think that by placing it in a variable first will be better, so I tried:

<xsl:variable name="valores"><xsl:value-of select="ROW[field1 = 'A' and field2 = 'B']" /></xsl:variable>

and then called:

<xsl:value-of select="$valores/f1" />
<xsl:value-of select="$valores/f2" />
<xsl:value-of select="$valores/f3" />

but I receive the error:

"Reference to variable or parameter 'valores' must evaluate to a node list."

What should I do?

Thanks
Jaime


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