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RE: [xsl] A more concise way to handle empty numeric elements

2007-06-07 06:24:57
Google for "XSLT 1.0 sum of computed value"

(You're wanting to compute the numbers being summed by replacing "" by 0).

Not easy in XSLT 1.0, but there are a number of solutions. Much easier in
2.0.

Michael Kay
http://www.saxonica.com/ 

-----Original Message-----
From: Mark Anderson 
[mailto:mark(_dot_)anderson(_at_)technique-group(_dot_)com] 
Sent: 07 June 2007 14:01
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: [xsl] A more concise way to handle empty numeric elements

Hi All

I have to process an XML file that contains a lot of numeric 
data. Many of the elements that have no value are empty 
instead of being zero and it may differ for each line, for example

<line id=1>
            <cost1>1000</cost1>
            <cost2>0</cost2> <!-- 0 here, but empty in next line -->
            <cost3></cost3>
</line>
<line id=2>
            <cost1>2000</cost1>
            <cost2></cost2>
            <cost3>3000</cost3>
</line>

I want to do: 

<xsl:for-each select="line">
       <xsl:value-of select="format-number(cost1 + cost2 + 
cost3,'#,###')"/>
      </xsl:for-each>

However, the empty elements will cause "NaN" to be displayed

To fix it I can do:

<xsl:for-each select="line">
<xsl:variable name="cost1">
      <xsl:choose>
            <xsl:when test="(cost1 &gt;= 0)"><xsl:value-of 
select="cost1"/></xsl:when>
            <xsl:otherwise>0</xsl:otherwise>
      </xsl:choose>
</xsl:variable>
<xsl:variable name="cost2">
      <xsl:choose>
            <xsl:when test="(cost2 &gt;= 0)"><xsl:value-of 
select="cost2"/></xsl:when>
            <xsl:otherwise>0</xsl:otherwise>
      </xsl:choose>
</xsl:variable>
<xsl:variable name="cost3">
      <xsl:choose>
            <xsl:when test="(cost3 &gt;= 0)"><xsl:value-of 
select="cost3"/></xsl:when>
            <xsl:otherwise>0</xsl:otherwise>
      </xsl:choose>
</xsl:variable>
       <xsl:value-of select="format-number($cost1 + $cost2 + 
$cost3,'#,###')"/>
      </xsl:for-each>

However, it seems very long winded. Also the output is HTML, 
so it makes it hard to read the HTML with so much XML interwoven.

I realized I could write a template to return 0 for each 
empty element, but the call-template and parameter 
declaration will add further lines.

Is there a more succinct/elegant way to do it? (it's a shame 
"number(cost1)" doesn't return 0 for empty elements)

BTW: I'm using XSLT1.0 and can't use any extensions

Thanks in advance
M a r k 


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