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Summing XML data that is in two arrays

问答 作者：

I am very new to XSL and XML and have, I hope, an easy question. I have an XML file that has two arrays of numbers in them that I need to sum. Here is part of the XML file

<?xml version="1.0" encoding="UTF-8"?>
<out_xml>
<Root>
    <ItemCollection>
        <Item name="BaseLineOffSet" type="2">
            <Histogram>
                <DispOrder>This is Order</DispOrder>
                <IntensityArray>
                    <Intensity>105.84667205810547</Intensity>
                    <Intensity>105.83854675292969</Intensity>
                    <Intensity>105.57729339599609</Intensity>
                    <Intensity>105.66104888916016</Intensity>
                    <Intensity>105.56392669677734</Intensity>
                    <Intensity>105.33917236328125</Intensity>
                    <Intensity>105.33854675292969</Intensity>
                    <Intensity>105.31544494628906</Intensity>
                    <Intensity>105.40036010742187</Intensity>
                    <Intensity>105.21470642089844</Intensity>
                    <Intensity>105.14356994628906</Intensity>
                    <Intensity>104.92792510986328</Intensity>
                    <Intensity>104.93791961669922</Intensity>
                    <Intensity>104.93979644775391</Intensity>
                    <Intensity>104.96470642089844</Intensity>
                    <Intensity>105.01107025146484</Intensity>
                    <Intensity>104.76479339599609</Intensity>
                    <Intensity>104.9085693359375</Intensity>
                    <Intensity>104.70166778564453</Intensity>
                    <Intensity>104.75499725341797</Intensity>
                    <Intensity>104.77352905273437</Intensity>
                    <Intensity>104.77714538574219</Intensity>
                    <Intensity>104.59485626220703</Intensity>
                    <Intensity>104.73235321044922</Intensity>
                    <Intensity>104.35479736328125</Intensity>
                    <Intensity>104.56911468505859</Intensity>
                    <Intensity>104.38999938964844</Intensity>
                    <Intensity>104.30992889404297</Intensity>
                    <Intensity>104.37964630126953</Intensity>
                </IntensityArray>
            </Histogram>
        </Item>
        <Item name="DispIntervalsMaxValues" type="2">
            <Histogram>
                <DispOrder>This is Order</DispOrder>
                <IntensityArray>
                    <Intensity>1.0229243040084839</Intensity>
                    <Intensity>48.868541717529297</Intensity>
                    <Intensity>47.504795074462891</Intensity>
                    <Intensity>162.17105102539062</Intensity>
                    <Intensity>91.323570251464844</Intensity>
                    <Intensity>44.405426025390625</Intensity>
                  开发者_如何学JAVA  <Intensity>51.243541717529297</Intensity>
                    <Intensity>131.44705200195312</Intensity>
                    <Intensity>2.8496425151824951</Intensity>
                    <Intensity>21.435295104980469</Intensity>
                    <Intensity>47.006423950195312</Intensity>
                    <Intensity>0.72917240858078003</Intensity>
                    <Intensity>46.669178009033203</Intensity>
                    <Intensity>83.804801940917969</Intensity>
                    <Intensity>44.197799682617187</Intensity>
                    <Intensity>32.138923645019531</Intensity>
                    <Intensity>30.30479621887207</Intensity>
                    <Intensity>58.928920745849609</Intensity>
                    <Intensity>29.930421829223633</Intensity>
                    <Intensity>38.282505035400391</Intensity>
                    <Intensity>30.801467895507813</Intensity>
                    <Intensity>43.710361480712891</Intensity>
                    <Intensity>38.167644500732422</Intensity>
                    <Intensity>27.842643737792969</Intensity>
                    <Intensity>34.102294921875</Intensity>
                    <Intensity>61.118381500244141</Intensity>
                    <Intensity>10.910002708435059</Intensity>
                    <Intensity>3.6150767803192139</Intensity>
                    <Intensity>3.1703603267669678</Intensity>
                </IntensityArray>
            </Histogram>
        </Item>
    </ItemCollection>
</Root>
</out_xml>

What I really want is the sum of the the elements from the two Intensity arrays to be added up. So it would be something like this:

FirstArray[0]+SecondArray[0]=sum[0] which is really

105.84667205810547 + 1.0229243040084839=106.8696 and

FirstArray[1]+SecondArray[1] =sum[1]

105.83854675292969+ 48.868541717529297=154.7071 and so on ...

There are a few other Items in between these two that I need to ignore for now.

Thanks !

Does the following do what you need it to?

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output omit-xml-declaration="yes" indent="yes"/>

  <xsl:template match="/">
    <root>
      <xsl:apply-templates select="//ItemCollection"/>
    </root>
  </xsl:template>

  <xsl:template match="ItemCollection">
    <xsl:variable name="itemCollection" select="." />
    <xsl:variable name="itemsCount" select="count((.//IntensityArray)[1]//Intensity)" />

    <xsl:for-each select="1 to $itemsCount">
       <xsl:variable name="itemIndex" select="." />
       <sum position="{$itemIndex}">
         <xsl:value-of select="sum($itemCollection//IntensityArray//Intensity[$itemIndex])" />
       </sum>
    </xsl:for-each>
  </xsl:template>

</xsl:stylesheet>

I got the following output when I ran it on your sample data:

<root>
   <sum position="1">106.86959636211395</sum>
   <sum position="2">154.70708847045898</sum>
   <sum position="3">153.08208847045898</sum>
   <sum position="4">267.8320999145508</sum>
   <sum position="5">196.8874969482422</sum>
   <sum position="6">149.74459838867187</sum>
   <sum position="7">156.58208847045898</sum>
   <sum position="8">236.7624969482422</sum>
   <sum position="9">108.25000262260437</sum>
   <sum position="10">126.6500015258789</sum>
   <sum position="11">152.14999389648437</sum>
   <sum position="12">105.65709751844406</sum>
   <sum position="13">151.60709762573242</sum>
   <sum position="14">188.74459838867187</sum>
   <sum position="15">149.16250610351562</sum>
   <sum position="16">137.14999389648437</sum>
   <sum position="17">135.06958961486816</sum>
   <sum position="18">163.8374900817871</sum>
   <sum position="19">134.63208961486816</sum>
   <sum position="20">143.03750228881836</sum>
   <sum position="21">135.5749969482422</sum>
   <sum position="22">148.48750686645508</sum>
   <sum position="23">142.76250076293945</sum>
   <sum position="24">132.5749969482422</sum>
   <sum position="25">138.45709228515625</sum>
   <sum position="26">165.68749618530273</sum>
   <sum position="27">115.3000020980835</sum>
   <sum position="28">107.92500567436218</sum>
   <sum position="29">107.5500066280365</sum>
</root>

Updated:

Look at sum function, e.g.:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output omit-xml-declaration="yes" indent="yes"/>

  <xsl:key name="k" match="Intensity" use="count(preceding-sibling::Intensity)"/>

  <xsl:template match="/">
    <root>
      <xsl:apply-templates select="//Intensity[generate-id(.) = 
                           generate-id(key('k', count(preceding-sibling::Intensity)))]"/>
    </root>
  </xsl:template>

  <xsl:template match="Intensity">
    <sum>
      <xsl:value-of select="sum(key('k', count(preceding-sibling::Intensity)))"/>
    </sum>
  </xsl:template>

</xsl:stylesheet>

This template sums Intensity elements for both IntensityArray.

Output:

<root>
  <sum>106.86959636211395</sum>
  <sum>154.70708847045898</sum>
  <sum>153.08208847045898</sum>
  <sum>267.8320999145508</sum>
  <sum>196.8874969482422</sum>
  <sum>149.74459838867187</sum>
  <sum>156.58208847045898</sum>
  <sum>236.7624969482422</sum>
  <sum>108.25000262260437</sum>
  <sum>126.6500015258789</sum>
  <sum>152.14999389648437</sum>
  <sum>105.65709751844406</sum>
  <sum>151.60709762573242</sum>
  <sum>188.74459838867187</sum>
  <sum>149.16250610351562</sum>
  <sum>137.14999389648437</sum>
  <sum>135.06958961486816</sum>
  <sum>163.8374900817871</sum>
  <sum>134.63208961486816</sum>
  <sum>143.03750228881836</sum>
  <sum>135.5749969482422</sum>
  <sum>148.48750686645508</sum>
  <sum>142.76250076293945</sum>
  <sum>132.5749969482422</sum>
  <sum>138.45709228515625</sum>
  <sum>165.68749618530273</sum>
  <sum>115.3000020980835</sum>
  <sum>107.92500567436218</sum>
  <sum>107.5500066280365</sum>
</root>

This transformation produces the wanted result even in cays the two node-sets have different number of nodes and/or some of the nodes in the 2nd node-set don't have value that is castable to a number:

<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output omit-xml-declaration="yes" indent="yes"/>
 <xsl:strip-space elements="*"/>

 <xsl:variable name="vArr1" select=
   "/*/*/*/Item[1]/*/IntensityArray/*"/>
 <xsl:variable name="vArr2" select=
   "/*/*/*/Item[2]/*/IntensityArray/*"/>

 <xsl:variable name="vShorterArr" select=
  "$vArr1[not(count($vArr1) > count($vArr2))]
  |
   $vArr2[not(count($vArr2) >= count($vArr1))]
  "/>

 <xsl:variable name="vLongerArr" select=
  "$vArr2[not(count($vArr1) > count($vArr2))]
  |
   $vArr1[not(count($vArr2) >= count($vArr1))]
  "/>

 <xsl:template match="/">
     <summedIntensities>
       <xsl:apply-templates select="$vLongerArr"/>
     </summedIntensities>
 </xsl:template>

 <xsl:template match="Intensity">
  <xsl:variable name="vPos" select="position()"/>
  <Intensity>
   <xsl:variable name="vVal2" select="$vShorterArr[position()=$vPos]"/>
   <xsl:value-of select=
     ".
   +
      concat('0',
             substring($vVal2,
                       1 div (number($vVal2) = number($vVal2))
                       )
             )
     "/>
  </Intensity>
 </xsl:template>
</xsl:stylesheet>

when this transformation is applied to the following XML document (the same as the provided one, but added to the first node-set one more Intensity element (the last one), to make the two node-sets different in size):

<out_xml>
    <Root>
        <ItemCollection>
            <Item name="BaseLineOffSet" type="2">
                <Histogram>
                    <DispOrder>This is Order</DispOrder>
                    <IntensityArray>
                        <Intensity>105.84667205810547</Intensity>
                        <Intensity>105.83854675292969</Intensity>
                        <Intensity>105.57729339599609</Intensity>
                        <Intensity>105.66104888916016</Intensity>
                        <Intensity>105.56392669677734</Intensity>
                        <Intensity>105.33917236328125</Intensity>
                        <Intensity>105.33854675292969</Intensity>
                        <Intensity>105.31544494628906</Intensity>
                        <Intensity>105.40036010742187</Intensity>
                        <Intensity>105.21470642089844</Intensity>
                        <Intensity>105.14356994628906</Intensity>
                        <Intensity>104.92792510986328</Intensity>
                        <Intensity>104.93791961669922</Intensity>
                        <Intensity>104.93979644775391</Intensity>
                        <Intensity>104.96470642089844</Intensity>
                        <Intensity>105.01107025146484</Intensity>
                        <Intensity>104.76479339599609</Intensity>
                        <Intensity>104.9085693359375</Intensity>
                        <Intensity>104.70166778564453</Intensity>
                        <Intensity>104.75499725341797</Intensity>
                        <Intensity>104.77352905273437</Intensity>
                        <Intensity>104.77714538574219</Intensity>
                        <Intensity>104.59485626220703</Intensity>
                        <Intensity>104.73235321044922</Intensity>
                        <Intensity>104.35479736328125</Intensity>
                        <Intensity>104.56911468505859</Intensity>
                        <Intensity>104.38999938964844</Intensity>
                        <Intensity>104.30992889404297</Intensity>
                        <Intensity>104.37964630126953</Intensity>
                        <Intensity>105.37964630126953</Intensity>
                    </IntensityArray>
                </Histogram>
            </Item>
            <Item name="DispIntervalsMaxValues" type="2">
                <Histogram>
                    <DispOrder>This is Order</DispOrder>
                    <IntensityArray>
                        <Intensity>1.0229243040084839</Intensity>
                        <Intensity>48.868541717529297</Intensity>
                        <Intensity>47.504795074462891</Intensity>
                        <Intensity>162.17105102539062</Intensity>
                        <Intensity>91.323570251464844</Intensity>
                        <Intensity>44.405426025390625</Intensity>
                        <Intensity>51.243541717529297</Intensity>
                        <Intensity>131.44705200195312</Intensity>
                        <Intensity>2.8496425151824951</Intensity>
                        <Intensity>21.435295104980469</Intensity>
                        <Intensity>47.006423950195312</Intensity>
                        <Intensity>0.72917240858078003</Intensity>
                        <Intensity>46.669178009033203</Intensity>
                        <Intensity>83.804801940917969</Intensity>
                        <Intensity>44.197799682617187</Intensity>
                        <Intensity>32.138923645019531</Intensity>
                        <Intensity>30.30479621887207</Intensity>
                        <Intensity>58.928920745849609</Intensity>
                        <Intensity>29.930421829223633</Intensity>
                        <Intensity>38.282505035400391</Intensity>
                        <Intensity>30.801467895507813</Intensity>
                        <Intensity>43.710361480712891</Intensity>
                        <Intensity>38.167644500732422</Intensity>
                        <Intensity>27.842643737792969</Intensity>
                        <Intensity>34.102294921875</Intensity>
                        <Intensity>61.118381500244141</Intensity>
                        <Intensity>10.910002708435059</Intensity>
                        <Intensity>3.6150767803192139</Intensity>
                        <Intensity>3.1703603267669678</Intensity>
                    </IntensityArray>
                </Histogram>
            </Item>
        </ItemCollection>
    </Root>
</out_xml>

the wanted, correct result is produced:

<summedIntensisites>
   <Intensity>106.86959636211395</Intensity>
   <Intensity>154.70708847045898</Intensity>
   <Intensity>153.08208847045898</Intensity>
   <Intensity>267.8320999145508</Intensity>
   <Intensity>196.8874969482422</Intensity>
   <Intensity>149.74459838867188</Intensity>
   <Intensity>156.58208847045898</Intensity>
   <Intensity>236.7624969482422</Intensity>
   <Intensity>108.25000262260437</Intensity>
   <Intensity>126.6500015258789</Intensity>
   <Intensity>152.14999389648438</Intensity>
   <Intensity>105.65709751844406</Intensity>
   <Intensity>151.60709762573242</Intensity>
   <Intensity>188.74459838867188</Intensity>
   <Intensity>149.16250610351562</Intensity>
   <Intensity>137.14999389648438</Intensity>
   <Intensity>135.06958961486816</Intensity>
   <Intensity>163.8374900817871</Intensity>
   <Intensity>134.63208961486816</Intensity>
   <Intensity>143.03750228881836</Intensity>
   <Intensity>135.5749969482422</Intensity>
   <Intensity>148.48750686645508</Intensity>
   <Intensity>142.76250076293945</Intensity>
   <Intensity>132.5749969482422</Intensity>
   <Intensity>138.45709228515625</Intensity>
   <Intensity>165.68749618530273</Intensity>
   <Intensity>115.3000020980835</Intensity>
   <Intensity>107.92500567436218</Intensity>
   <Intensity>107.5500066280365</Intensity>
   <Intensity>105.37964630126953</Intensity>
</summedIntensisites>

Explanation:

  1. Two variables are defined, each containing the nodes that comprize an "array".

  2. Another two variables are defined: $vShorterArr, containing the shorter node-set and $vLongerArr containing the longer node-set.

  3. Templates are applied to the longer node-set.

  4. Each node in the longer node-set is summed with the corresponding (if such exists) node in the shorter node-set, or with 0, otherwise.

II. XSLT 2.0 solution:

<xsl:stylesheet version="2.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 xmlns:xs="http://www.w3.org/2001/XMLSchema">
 <xsl:output omit-xml-declaration="yes" indent="yes"/>
 <xsl:strip-space elements="*"/>

 <xsl:variable name="vArr1" select=
   "/*/*/*/Item[1]/*/IntensityArray/*/number()"/>
 <xsl:variable name="vArr2" select=
   "/*/*/*/Item[2]/*/IntensityArray/*/number()"/>

 <xsl:variable name="vShorterArr" select=
  "if(count($vArr1) lt count($vArr2))
     then $vArr1
     else $vArr2
  "/>
 <xsl:variable name="vLongerArr" select=
  "if(count($vArr1) ge count($vArr2))
     then $vArr1
     else $vArr2
  "/>

 <xsl:template match="/">
     <summedIntensities>
       <xsl:for-each select="$vLongerArr">
          <xsl:variable name="vPos" select="position()"/>
          <Intensity>
           <xsl:variable name="vVal2" select=
                "$vShorterArr[$vPos]"/>
           <xsl:sequence select=
             ".
           +
              (if($vVal2 castable as xs:double)
                then $vVal2
                else 0
                )
             "/>
          </Intensity>
       </xsl:for-each>
     </summedIntensities>
 </xsl:template>
</xsl:stylesheet>

III. Using FXSL:

It is much easier to solve this problem using the f:zip-with() function/template of FXSL.

Below is a solution using FXSL 2:

<xsl:stylesheet version="2.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 xmlns:f="http://fxsl.sf.net/"
 exclude-result-prefixes="f"
>
  <xsl:import href="../f/func-zipWithDVC.xsl"/>
  <xsl:import href="../f/func-Operators.xsl"/>

  <!-- To be applied on numList.xml -->
  <xsl:output omit-xml-declaration="yes" indent="yes"/>

  <xsl:template match="/">
     <summedIntensities>
      <xsl:for-each select=
      "f:zipWith(f:add(),
                 /*/*/*/Item[1]/*/IntensityArray/*/number(),
                 /*/*/*/Item[2]/*/IntensityArray/*/number()
                 )"
      >
       <Intensity>
        <xsl:sequence select="."/>
       </Intensity>
      </xsl:for-each>
     </summedIntensities>
  </xsl:template>
</xsl:stylesheet>

继续阅读：additionarraysxmlxslt

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