2 <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
3 <xsl:template match="/">
4 <xsl:copy-of select="site/open_auctions/open_auction[number(bidder[1]/increase) < number(bidder[floor((last() + 1) div 2)]/increase) and number(bidder[floor((last() + 1) div 2)]/increase) < number(bidder[last()]/increase)]/interval"/>