<xsl:apply-templates select="
     //T [ position() != last() ]
         [ count( $b[.  >=  current() and
                     . < current()/following-sibling::T[1]]) > 0]"/>
You don't need to use count() > 0 to check for existence... just do:
//T [ position() != last() ]
  [$b[.  >=  current() and . < current()/following-sibling::T[1]]]
-- 
Andrew Welch
http://andrewjwelch.com
Kernow: http://kernowforsaxon.sf.net/
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