Using position()

While looping through an xsl:for-each select, I can do this: <xsl:if
test="./@t_orno = '100000006'"> to compare an the value of the t_orno
attribute to a static string, and I can do this: <xsl:if test="./@t_orno =
//row[1]/@t_orno"> to compare it to the value of the attribute in row
1...but what I really want to do is to compare the attribute value to the
attribute value immediately preceding it. I thought this would work: <xsl:if
test="./@t_orno = //row[position()-1]/@t_orno"> but it doesn't.
 
--Steve

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