Martin provided this solution to joining three tables (ARPT --> ANAV -->
BDRY):
-------------------------------------------------
<xsl:sequence select="
	 key('ARPT-to-ANAV', ARPT_IDENT) !
      	key('ANAV-to-BDRY',(NAV_IDENT,NAV_CTRY,NAV_TYPE))[TYPE eq
'08']/BDRY_IDENT"
/>
-------------------------------------------------
That is awesome Martin. It produces the correct results, it is compact, and it
is lightning fast.

/Roger