xslt: how to normalize numerical element - xslt

Question

I would like to add an element to existing XML file with normalized value of existing element in the XML.
Any help would be extremely appreciated.
regards
<?xml version="1.0" encoding="UTF-8"?>
<top>
<Results>
<a>no</a>
<b>10</b>
<c>12</c>
<d>9</d>
</Results>
<Results>
<a>no</a>
<b>8</b>
<c>50</c>
<d>12</d>
</Results>
<Results>
<a>no</a>
<b>6</b>
<c>55</c>
<d>56</d>
</Results>
<Results>
<a>yes</a>
<b>23</b>
<c>32</c>
<d>34</d>
</Results>
</top>
In the sample input xml above, I would like to add "b_nom" elements to each of the results where the value is (b)/(minimum of 'b' grouped with a). The expected output is as below
<?xml version="1.0" encoding="UTF-8"?>
<top>
<Results>
<a>no</a>
<b>10</b>
<b_nom>1.66</b_nom>
<c>12</c>
<d>9</d>
</Results>
<Results>
<a>no</a>
<b>8</b>
<b_nom>1.33</b_nom>
<c>50</c>
<d>12</d>
</Results>
<Results>
<a>no</a>
<b>6</b>
<b_nom>1</b_nom>
<c>55</c>
<d>56</d>
</Results>
<Results>
<a>yes</a>
<b>23</b>
<b_nom>1</b_nom>
<c>32</c>
<d>34</d>
</Results>
</top>

Answer 1

I think you want
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:key name="k1" match="Results" use="a"/>
<xsl:template match="#* | node()" name="identity">
<xsl:copy>
<xsl:apply-templates select="#* | node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="b">
<xsl:call-template name="identity"/>
<xsl:variable name="min">
<xsl:for-each select="key('k1', ../a)">
<xsl:sort select="b" data-type="number"/>
<xsl:if test="position() = 1">
<xsl:value-of select="b"/>
</xsl:if>
</xsl:for-each>
</xsl:variable>
<b_nom>
<xsl:value-of select="format-number(. div $min, '0.##')"/>
</b_nom>
</xsl:template>
</xsl:stylesheet>
Here is a changed version of the stylesheet that takes a couple of values identifying a group into account:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:data="http:://example.com/data"
exclude-result-prefixes="data">
<data:data xmlns="">
<group>
<key>no</key>
<values>
<value>no</value>
<value>n</value>
<value>0</value>
</values>
</group>
<group>
<key>yes</key>
<values>
<value>yes</value>
<value>y</value>
<value>1</value>
</values>
</group>
</data:data>
<xsl:output method="xml" indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:variable name="main-input" select="/"/>
<xsl:variable name="groups" select="document('')/xsl:stylesheet/data:data/group"/>
<xsl:template match="#* | node()" name="identity">
<xsl:copy>
<xsl:apply-templates select="#* | node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="b">
<xsl:call-template name="identity"/>
<xsl:variable name="this" select="."/>
<xsl:variable name="min">
<xsl:for-each select="$main-input//Results[a = $groups/values[value = $this/../a]/value]">
<xsl:sort select="b" data-type="number"/>
<xsl:if test="position() = 1">
<xsl:value-of select="b"/>
</xsl:if>
</xsl:for-each>
</xsl:variable>
<b_nom>
<xsl:value-of select="format-number(. div $min, '0.##')"/>
</b_nom>
</xsl:template>
</xsl:stylesheet>
That transforms the input
<?xml version="1.0" encoding="UTF-8"?>
<top>
<Results>
<a>no</a>
<b>10</b>
<c>12</c>
<d>9</d>
</Results>
<Results>
<a>n</a>
<b>8</b>
<c>50</c>
<d>12</d>
</Results>
<Results>
<a>0</a>
<b>6</b>
<c>55</c>
<d>56</d>
</Results>
<Results>
<a>yes</a>
<b>23</b>
<c>32</c>
<d>34</d>
</Results>
</top>
into the output
<top>
<Results>
<a>no</a>
<b>10</b>
<b_nom>1.67</b_nom>
<c>12</c>
<d>9</d>
</Results>
<Results>
<a>n</a>
<b>8</b>
<b_nom>1.33</b_nom>
<c>50</c>
<d>12</d>
</Results>
<Results>
<a>0</a>
<b>6</b>
<b_nom>1</b_nom>
<c>55</c>
<d>56</d>
</Results>
<Results>
<a>yes</a>
<b>23</b>
<b_nom>1</b_nom>
<c>32</c>
<d>34</d>
</Results>
</top>