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[xsl] Summing a Calculation


Subject: [xsl] Summing a Calculation
From: Mark Swardstrom <mark@xxxxxxxxxx>
Date: Thu, 21 Jun 2001 11:55:25 -0700

I'm trying to get the sum of a purchase order, which seems simple, but I
can't find an easy solution.

Consider the following XML:

<order>
	<item>
		<id>1</id>
		<price>1.34</price>
		<quantity>4</quantity>
	</item>
	<item>
		<id>2</id>
		<price>5.77</price>
		<quantity>3</quantity>
	</item>
	<item>
		<id>5</id>
		<price>12.99</price>
		<quantity>1</quantity>
	</item>
</order>

I was trying to do something along these lines:

<xsl:template match="order">
	<xsl:apply-templates select="item"/>
	<b>Total price: <xsl:value-of select="sum(item/price *
item/quantity)"/></b>
</xsl:template>

To get a total amount for the entire order.

But that gives the following error.  

	Can not convert #NUMBER to a NodeList!

Before I go down the (seemingly too complex) recursive loop approach, I was
wondering if anyone else had another idea.

Thanks.

- Mark


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