If Work_Location_longitude is an element, then presumably you
could do this:
<xsl:value-of select="(Work_Location_longitude/position() - 1) * 15"/>
This would return a value 0, 15, 30, 45, etc. depending on
the position of the Work_Location_longitude element relative
to its parent.
If there are three WLL elements, then WLL/position() returns the sequence
(1,2,3), and subtracting one from this sequence is an error.
Michael Kay
http://www.saxonica.com/
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