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Re: calculating pow of numbers and a final sum

2003-01-22 04:04:53
I have to thank for your input.
The next problem I have is to choose which solution I take ;-)
All of them are working.

Thanx

----- Original Message ----- 
From: "Francis Norton" <francis(_at_)redrice(_dot_)com>
To: <xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com>
Sent: Wednesday, January 22, 2003 11:34 AM
Subject: Re: [xsl] calculating pow of numbers and a final sum


Hi Andreas,

I think that this is one of those occasions wher you do need to use 
recursion - I can't (at this time of morning) see any way of doing it 
with a simple XPath maths expression, or even XPath numeric expressions 
inside a loop.

Try something like this -

<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
    <xsl:output method="text"/>
    <!-- case conversion variables -->
    <xsl:variable name="abc">abcdefghijklmnopqrstuvwxyz</xsl:variable>
    <xsl:variable name="ABC">ABCDEFGHIJKLMNOPQRSTUVWXYZ</xsl:variable>
    <!-- kick off recursive transform -->
    <xsl:template match="logging">
        <xsl:apply-templates select="target[1]"/>
    </xsl:template>
    <!-- simple tail-end recursive transform -->
    <xsl:template match="target">
        <xsl:param name="base" select="1" />
        public static final int <xsl:value-of select="translate(@name, 
$abc, $ABC)" /> = <xsl:value-of select="$base" />;
        <xsl:apply-templates select="following-sibling::target[1]">
            <xsl:with-param name="base" select="$base * 2" />
        </xsl:apply-templates>
    </xsl:template>
</xsl:stylesheet>

Using recursion to step through a sequence of elements, one by one, is 
in fact a helpful in many cased where you need to perform arbitrary 
cumulative operations which can't be done using numeric operators, 
sum(), position() or xsl:number, for instance in reports.

Francis.

-- 
"Never mind manoeuvre, go straight at 'em." - Admiral Horatio Nelson



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