XSLT将数字添加到变量

Question

i have XSLT, where i have variables (DPH5 and DPH22). On start the variables are null. After that i add tu this variables sum od DPH. This is part of my XML:

<TeloTR>
   <TYP_CASTKY>DP</TYP_CASTKY>
   <PROCENTO_DANE>21.0</PROCENTO_DANE>
   <CASTKA>100.720</CASTKA>
</TeloTR>
<TeloTR>
   <TYP_CASTKY>DP</TYP_CASTKY>
   <PROCENTO_DANE>15.0</PROCENTO_DANE>
   <CASTKA>562.720</CASTKA>
</TeloTR>
<TeloTR>
   <TYP_CASTKY>DP</TYP_CASTKY>
   <PROCENTO_DANE>15.0</PROCENTO_DANE>
   <CASTKA>66375.720</CASTKA>
</TeloTR>
<TeloTR>
   <TYP_CASTKY>DP</TYP_CASTKY>
   <PROCENTO_DANE>15.0</PROCENTO_DANE>
   <CASTKA>845.720</CASTKA>
</TeloTR>

This is my variables:

<xsl:variable name="DPH5" select="0" />
<xsl:variable name="DPH22" select="0" />

This is part of my code:

<xsl:for-each select="TeloTR">
    <xsl:if test="TYP_CASTKY='DP'">
       <xsl:if test="PROCENTO_DANE='15.0'">
          <xsl:variable name="DPH5" select="$DPH5 + number(@CASTKA) " />  
       </xsl:if>
       <xsl:if test="PROCENTO_DANE='21.0'">
          <xsl:variable name="DPH22" select="$DPH22 + number(@CASTKA) " />  
       </xsl:if>                    
    </xsl:if>
</xsl:for-each>

But i have this error:

Error:XSLTProcessor::transformToXml() [<a href='xsltprocessor.transformtoxml'>
xsltprocessor.transformtoxml</a>]: XSLT-variable: Redefinition of variable 'DPH5'.

Have you any ideas how could i add values to variables? Thanks

Answer 1

As mentioned in comments, In XSLT, variable are 'immutable' and cannot be changed once set.

However you can solve your particular problem by using the sum function, to sum all the nodes (or attributes) that match a certain condition.

Try these two variable declarations

  <xsl:variable name="DPH5" select="sum(TeloTR[TYP_CASTKY='DP'][PROCENTO_DANE = 15.0]/CASTKA) " />  
  <xsl:variable name="DPH22" select="sum(TeloTR[TYP_CASTKY='DP'][PROCENTO_DANE = 22.0]/CASTKA) " />  

Note that CASTKA is an element in your XML, so you shouldn't use the @ prefix which denotes an attribute.

Alternatively, to avoid a little repetition, you can do this

  <xsl:variable name="TeloTR" select="TeloTR[TYP_CASTKY='DP']" />
  <xsl:variable name="DPH5" select="sum($TeloTR[PROCENTO_DANE = 15.0]/CASTKA) " />  
  <xsl:variable name="DPH22" select="sum($TeloTR[PROCENTO_DANE = 21.0]/CASTKA) " />