So what I need to do is add all the previous months of December to the
current month of December:
that would just be <xsl:value-of
select="sum(preceding-sibling::year/month[(_at_)month='December']/@percentage-increase)"/>
But it sounds like you want a product, not a sum????
The first year (1937) increases only 103 percent from the previous year.
The next year (1938)shows an increase of 102 percent from 1937. But
cumalitively it shows an increase of 105 percent: 103 + 102 = 105.
The next year (1939) shows an increae of 108 percent. Cumulatively,
this is 113: 103 + 102 + 108 = 113.
cumulative interest isn't additive
The increase over three years is 1.03 * 1.02 * 1.08 =~ 1.135 or 13.5%
so you will need a recursive template as xpath2 doesn't have a product
built in (or you could use saxon7's implementation of xpath 2 draft,
which does)
David
--
http://www.dcarlisle.demon.co.uk/matthew
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