When the template matches line with LineNumber 1, the UnitPrice for
LineNumber 1.1, 2, 3 are not yet know.
You're thinking about this in terms of order-of-evaluation, which is
undefined. Use of time-related words like "when" and "not yet" is therefore
best avoided.
Functionally, you are saying that the UnitPrice of LineNumber 1 has a
functional dependency on the UnitPrice of LineNumber 1.1, 1.2, 1.3 etc.
You stated:
1. If the itemTypeCode of the current Item is '1' then unitPrice is netPrice
2. If the itemTypeCode of the current Item is '2' then unitPrice is sum of
all the (unitPrice/quantity) of all the child lines 3. If the itemTypeCode
of the current Item is '3' then unitPrice is Sum of unitPrice of only the
first level child elements
The above defn should be applied at all levels where unitPrice is
calculated.
That looks to me like a recursive function:
<xsl:function name="f:unitPrice" as="xs:decimal">
<xsl:param name="item" as="element(orderline)">
<xsl:choose>
<xsl:when test="$item/itemTypeCode = 1">
<xsl:sequence select="$item/netPrice"/>
</xsl:when>
<xsl:when test="$item/itemTypeCode = 2">
<xsl:sequence select="sum(for $c in $item/child::orderline
return f:unitPrice($c) * $c/quantity)"/>
</xsl:when>
<xsl:when test="$item/itemTypeCode = 3">
<xsl:sequence select="??"/>
<!-- I don't understand the difference between this and the previous
case -->
</xsl:when>
</xsl:choose>
</xsl:function>
Michael Kay
http://www.saxonica.com/
-----Original Message-----
From: Raghu Narayan Koratagere
[mailto:raghu(_dot_)k(_dot_)n(_at_)gmail(_dot_)com]
Sent: 19 November 2007 10:32
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: Re: [xsl] XSL Trnasfromation - Is it possible to do
a bottom up transformation?
Micheal,
To clarify, here are the source and example of transformed xmls:
Source Tree:
=========
<orderline>
<linenum>1</linenum>
<productName>Computer</productName>
<netPrice>100</netPrice>
<itemTypeCode>3</itemTypeCode>
<quantity>1</quantity>
<orderline>
<linenum>1.1</linenum>
<productName>CPU</productName>
<netPrice>100</netPrice>
<itemTypeCode>3</itemTypeCode>
<quantity>2</quantity>
<orderline>
<linenum>1.1.1</linenum>
<productName>Mother Board</productName>
<netPrice>100</netPrice>
<itemTypeCode>2</itemTypeCode>
<quantity>2</quantity>
</orderline>
<orderline>
<linenum>1.1.2</linenum>
<productName>Processor</productName>
<netPrice>200</netPrice>
<itemTypeCode>2</itemTypeCode>
<quantity>2</quantity>
</orderline>
</orderline>
<orderline>
<linenum>2</linenum>
<productName>Table</productName>
<netPrice>100</netPrice>
<itemTypeCode>2</itemTypeCode>
<quantity>1</quantity>
</orderline>
<orderline>
<linenum>3</linenum>
<productName>UPS</productName>
<netPrice>100</netPrice>
<itemTypeCode>1</itemTypeCode>
<quantity>1</quantity>
</orderline>
</orderline>
Transformed Tree:
=============
<orderline>
<linenum>1</linenum>
<productName>Computer</productName>
<netPrice>100</netPrice>
<itemTypeCode>3</itemTypeCode>
<unitPrice>350</unitPrice> <!-- 150+100+100=350 -->
<quantity>1</quantity>
<orderline>
<linenum>1.1</linenum>
<productName>CPU</productName>
<netPrice>100</netPrice>
<itemTypeCode>3</itemTypeCode>
<unitPrice>150</unitPrice> <!-- 50+100=150 -->
<quantity>2</quantity>
<orderline>
<linenum>1.1.1</linenum>
<productName>Mother Board</productName>
<netPrice>100</netPrice>
<itemTypeCode>2</itemTypeCode>
<unitPrice>50</unitPrice> <!-- 100/2=50 -->
<quantity>2</quantity>
</orderline>
<orderline>
<linenum>1.1.2</linenum>
<productName>Processor</productName>
<netPrice>200</netPrice>
<itemTypeCode>2</itemTypeCode>
<unitPrice>100</unitPrice> <!-- 200/2=100 -->
<quantity>2</quantity>
</orderline>
</orderline>
<orderline>
<linenum>2</linenum>
<productName>Table</productName>
<netPrice>100</netPrice>
<itemTypeCode>2</itemTypeCode>
<unitPrice>100</unitPrice> <!-- 100/1=100 -->
<quantity>1</quantity>
</orderline>
<orderline>
<linenum>3</linenum>
<productName>UPS</productName>
<netPrice>100</netPrice>
<itemTypeCode>1</itemTypeCode>
<unitPrice>100</unitPrice> <!-- 100/1=100 -->
<quantity>1</quantity>
</orderline>
</orderline>
Issue:
====
When the template matches line with LineNumber 1, the
UnitPrice for LineNumber 1.1, 2, 3 are not yet know. So what
values will the function take to calculate?
I have not tried using the below rule, will try :
<xsl:template match="unitPrice[../itemTypeCode = '3']">
<xsl:copy><xsl:value-of select="sum(../unitPrice[1] div
../quantity[1])" /></xsl:copy> </xsl:template>
Thanks,
Raghu
On 11/19/07, Michael Kay <mike(_at_)saxonica(_dot_)com> wrote:
The problem is here you are transforming top down.
I don't understand your fixation with these terms bottom-up
and top-down.
Think functionally: x is a function of y. And it really
doesn't matter
whether a transformation is top-down, bottom-up, outside-in, or
inside-out, so long as it produces the right answer.
If Abel's solution produces the wrong answer then you need
to explain
the requirement more clearly. Sample input and output is
often useful
if it's difficult to explain it in clear English.
Michael Kay
http://www.saxonica.com/
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