how to sum subdocument properties - xslt

Question

There is list
<items>
<item parentid='1'>
<amount>3</amount>
</item>
<item parentid='2'>
<amount>1</amount>
</item>
</items>
and document:
<udata id='1'>
<price>10</price>
</udata>
<udata id='1'>
<price>20</price>
</udata>
How to sum price's all document's?
To sum count I use'd:
<xsl:value-of select="sum(items/item/amount)"/>
I'd use:
<xsl:apply-templates select="udata/items/item" mode='price2' />
<xsl:template mode='price2' match='item'>
<xsl:apply-templates select="document(concat('upage://', page/#parentId))" mode='price'>
<xsl:with-param select='amount' name='count'/>
</xsl:apply-templates>
</xsl:template>
<xsl:template mode='price' match='/'>
<xsl:param name='count'/>
<xsl:value-of select="$count * /udata/page/properties/group[#name='price_prop']/property[#name='price']/value"/>
</xsl:template>
In result i had:
3020
I need 50. How to do this?

Answer 1

Here is a sample assuming XSLT 2.0 (e.g. as possible with Saxon 9 or AltovaXML):
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="2.0">
<xsl:param name="data-url" select="'test2012050103.xml'"/>
<xsl:variable name="data-doc" select="document($data-url)"/>
<xsl:key name="k1" match="udata" use="#id"/>
<xsl:template match="items">
<xsl:value-of select="sum(for $item in item return $item/amount * key('k1', $item/#parentid, $data-doc)/price)"/>
</xsl:template>
</xsl:stylesheet>
Example documents are
<items>
<item parentid='1'>
<amount>3</amount>
</item>
<item parentid='2'>
<amount>1</amount>
</item>
</items>
and
<root>
<udata id='1'>
<price>10</price>
</udata>
<udata id='2'>
<price>20</price>
</udata>
</root>
Output is 50.
[edit]Here is an XSLT 1.0 stylesheet:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
<xsl:param name="data-url" select="'test2012050103.xml'"/>
<xsl:variable name="data-doc" select="document($data-url)"/>
<xsl:key name="k1" match="udata" use="#id"/>
<xsl:template match="items">
<xsl:call-template name="sum">
<xsl:with-param name="items" select="item"/>
</xsl:call-template>
</xsl:template>
<xsl:template name="sum">
<xsl:param name="items" select="/.."/>
<xsl:param name="total" select="0"/>
<xsl:choose>
<xsl:when test="not($items)">
<xsl:value-of select="$total"/>
</xsl:when>
<xsl:otherwise>
<xsl:variable name="price">
<xsl:for-each select="$data-doc">
<xsl:value-of select="$items[1]/amount * key('k1', $items[1]/#parentid)/price"/>
</xsl:for-each>
</xsl:variable>
<xsl:call-template name="sum">
<xsl:with-param name="items" select="$items[position() > 1]"/>
<xsl:with-param name="total" select="$total + $price"/>
</xsl:call-template>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>

Answer 2

Here is a shorter solution:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text"/>
<xsl:variable name="vPrices" select=
"document('file:///c:/temp/delete/priceData.xml')/*/*"/>
<xsl:template match="/*">
<xsl:apply-templates select="item[1]"/>
</xsl:template>
<xsl:template match="item" name="sumProducts">
<xsl:param name="pAccum" select="0"/>
<xsl:variable name="vNewAccum" select=
"$pAccum +amount * $vPrices[#id = current()/#parentid]/price"/>
<xsl:if test="not(following-sibling::*)">
<xsl:value-of select="$vNewAccum"/>
</xsl:if>
<xsl:apply-templates select="following-sibling::*">
<xsl:with-param name="pAccum" select="$vNewAccum"/>
</xsl:apply-templates>
</xsl:template>
</xsl:stylesheet>
When applied on the following XML document:
<items>
<item parentid='1'>
<amount>3</amount>
</item>
<item parentid='2'>
<amount>1</amount>
</item>
</items>
and having the file c:\temp\delete\priceData.xml contain:
<root>
<udata id='1'>
<price>10</price>
</udata>
<udata id='2'>
<price>20</price>
</udata>
</root>
then the wanted, correct result is produced:
50