XSLT: Modify attribute value based on sibling attribute value -

i have following xml:

<?xml version="1.0" encoding="utf-8"?> <odm fileoid="some oid" description="some desc" creationdatetime="2010-10-06t22:35:00-06:00" filetype="snapshot" >     <study oid="s_test">         <globalvariables>             <studyname>study_name</studyname>             <studydescription>                 study description             </studydescription>             <protocolname>some protocol name</protocolname>         </globalvariables>         <metadataversion oid="v1.0.0" name="metadataversion_v1.0.0">             <protocol>                 <studyeventref studyeventoid="se01" ordernumber="36" mandatory="yes"/>                 <studyeventref studyeventoid="se02" ordernumber="37" mandatory="yes"/>             </protocol>             <studyeventdef oid="se01"  name="some name 01" repeating="no" type="scheduled">                 <formref formoid="f01" mandatory="yes"/>                 <formref formoid="f02" mandatory="yes"/>             </studyeventdef>             <studyeventdef oid="se02"  name="some name 02" repeating="no" type="scheduled">               <formref formoid="f01" mandatory="yes"/>               <formref formoid="f02" mandatory="yes"/>             </studyeventdef>             <formdef oid="f01" name="some form name 01" repeating="no">                 <itemgroupref itemgroupoid="ig01" mandatory="yes"/>             </formdef>             <formdef oid="f02" name="some form name 02" repeating="no">                 <itemgroupref itemgroupoid="ig02" mandatory="yes"/>                 <itemgroupref itemgroupoid="ig03" mandatory="no"/>             </formdef>             <itemgroupdef oid="ig01" name="ungrouped" repeating="no" sasdatasetname="ungroupe">                 <itemref itemoid="i01" ordernumber="1" mandatory="yes"/>                 <itemref itemoid="i02" ordernumber="2" mandatory="yes"/>                 <itemref itemoid="i03" ordernumber="3" mandatory="yes"/>             </itemgroupdef>             <itemgroupdef oid="ig02" name="reasons2" repeating="yes" sasdatasetname="reasons2">                 <itemref itemoid="i04" ordernumber="1" mandatory="no"/>             </itemgroupdef>             <itemgroupdef oid="ig03" name="ungrouped" repeating="no" sasdatasetname="ungro002">                 <itemref itemoid="i05" ordernumber="1" mandatory="yes"/>                 <itemref itemoid="i06" ordernumber="2" mandatory="yes"/>             </itemgroupdef>         </metadataversion>     </study> </odm> 

what want is, each <itemgroupdef> element "name" attribute equal "ungrouped", change attribute value "xxx-ungrouped", xxx value of oid attribute <formdef> element has child <itemgroupref> itemgroupoid attribute equal oid atrribute of itemgroupdef element. of other attributes , of children of element should left unaltered.

for example, <itemgroupdef oid="ig01"> above, name attribute should changed "ungrouped" "f01-ungrouped" since oid, ig01, appears child of <formdef oid="f01"> element. guaranteed itemgroupdef oid value appears child of 1 <formdef> element.

the transformation should act on <itemgroupdef> elements name attribute value of "ungrouped" only. of <itemgroupdef> elements name attribute other "ungrouped" , of other elements in xml file should left unaltered.

this stylesheet:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/xsl/transform">     <xsl:key name="koidbyitemgroup" match="formdef/@oid"               use="../itemgroupref/@itemgroupoid"/>     <xsl:template match="node()|@*">         <xsl:copy>             <xsl:apply-templates select="node()|@*"/>         </xsl:copy>     </xsl:template>     <xsl:template match="itemgroupdef/@name[.='ungrouped']">         <xsl:attribute name="name">             <xsl:value-of select="concat(key('koidbyitemgroup',../@oid),                                          '-',.)"/>         </xsl:attribute>     </xsl:template> </xsl:stylesheet> 

output:

<odm fileoid="some oid" description="some desc" creationdatetime="2010-10-06t22:35:00-06:00" filetype="snapshot">     <study oid="s_test">         <globalvariables>             <studyname>study_name</studyname>             <studydescription>                 study description             </studydescription>             <protocolname>some protocol name</protocolname>         </globalvariables>         <metadataversion oid="v1.0.0" name="metadataversion_v1.0.0">             <protocol>                 <studyeventref studyeventoid="se01" ordernumber="36" mandatory="yes"></studyeventref>                 <studyeventref studyeventoid="se02" ordernumber="37" mandatory="yes"></studyeventref>             </protocol>             <studyeventdef oid="se01" name="some name 01" repeating="no" type="scheduled">                 <formref formoid="f01" mandatory="yes"></formref>                 <formref formoid="f02" mandatory="yes"></formref>             </studyeventdef>             <studyeventdef oid="se02" name="some name 02" repeating="no" type="scheduled">                 <formref formoid="f01" mandatory="yes"></formref>                 <formref formoid="f02" mandatory="yes"></formref>             </studyeventdef>             <formdef oid="f01" name="some form name 01" repeating="no">                 <itemgroupref itemgroupoid="ig01" mandatory="yes"></itemgroupref>             </formdef>             <formdef oid="f02" name="some form name 02" repeating="no">                 <itemgroupref itemgroupoid="ig02" mandatory="yes"></itemgroupref>                 <itemgroupref itemgroupoid="ig03" mandatory="no"></itemgroupref>             </formdef>             <itemgroupdef oid="ig01" name="f01-ungrouped" repeating="no" sasdatasetname="ungroupe">                 <itemref itemoid="i01" ordernumber="1" mandatory="yes"></itemref>                 <itemref itemoid="i02" ordernumber="2" mandatory="yes"></itemref>                 <itemref itemoid="i03" ordernumber="3" mandatory="yes"></itemref>             </itemgroupdef>             <itemgroupdef oid="ig02" name="reasons2" repeating="yes" sasdatasetname="reasons2">                 <itemref itemoid="i04" ordernumber="1" mandatory="no"></itemref>             </itemgroupdef>             <itemgroupdef oid="ig03" name="f02-ungrouped" repeating="no" sasdatasetname="ungro002">                 <itemref itemoid="i05" ordernumber="1" mandatory="yes"></itemref>                 <itemref itemoid="i06" ordernumber="2" mandatory="yes"></itemref>             </itemgroupdef>         </metadataversion>     </study> </odm> 

note: overwriting indentity rule. keys cross reference. node set keys.

from comments:

one question: xslt outputs elements <formref formoid="f01" mandatory="yes"></formref> when original elements <formref formoid="f01" mandatory="yes"/>. both of these correct xml standards, there way tell xslt output elements in same exact format?

maybe (tested msxsl, altova, saxon, oracle, xqsharp)

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/xsl/transform">     <xsl:key name="koidbyitemgroup" match="formdef/@oid"                  use="../itemgroupref/@itemgroupoid"/>     <xsl:template match="node()|@*">         <xsl:copy>             <xsl:apply-templates select="node()|@*"/>         </xsl:copy>     </xsl:template>     <xsl:template match="*[not(node())]">         <xsl:element name="{name()}">             <xsl:apply-templates select="@*"/>         </xsl:element>     </xsl:template>     <xsl:template match="itemgroupdef/@name[.='ungrouped']">         <xsl:attribute name="name">             <xsl:value-of select="concat(key('koidbyitemgroup',../@oid),                                              '-',.)"/>         </xsl:attribute>     </xsl:template> </xsl:stylesheet> 

output:

<odm fileoid="some oid" description="some desc" creationdatetime="2010-10-06t22:35:00-06:00" filetype="snapshot">     <study oid="s_test">         <globalvariables>             <studyname>study_name</studyname>             <studydescription>                 study description             </studydescription>             <protocolname>some protocol name</protocolname>         </globalvariables>         <metadataversion oid="v1.0.0" name="metadataversion_v1.0.0">             <protocol>                 <studyeventref studyeventoid="se01" ordernumber="36" mandatory="yes"/>                 <studyeventref studyeventoid="se02" ordernumber="37" mandatory="yes"/>             </protocol>             <studyeventdef oid="se01" name="some name 01" repeating="no" type="scheduled">                 <formref formoid="f01" mandatory="yes"/>                 <formref formoid="f02" mandatory="yes"/>             </studyeventdef>             <studyeventdef oid="se02" name="some name 02" repeating="no" type="scheduled">                 <formref formoid="f01" mandatory="yes"/>                 <formref formoid="f02" mandatory="yes"/>             </studyeventdef>             <formdef oid="f01" name="some form name 01" repeating="no">                 <itemgroupref itemgroupoid="ig01" mandatory="yes"/>             </formdef>             <formdef oid="f02" name="some form name 02" repeating="no">                 <itemgroupref itemgroupoid="ig02" mandatory="yes"/>                 <itemgroupref itemgroupoid="ig03" mandatory="no"/>             </formdef>             <itemgroupdef oid="ig01" name="f01-ungrouped" repeating="no" sasdatasetname="ungroupe">                 <itemref itemoid="i01" ordernumber="1" mandatory="yes"/>                 <itemref itemoid="i02" ordernumber="2" mandatory="yes"/>                 <itemref itemoid="i03" ordernumber="3" mandatory="yes"/>             </itemgroupdef>             <itemgroupdef oid="ig02" name="reasons2" repeating="yes" sasdatasetname="reasons2">                 <itemref itemoid="i04" ordernumber="1" mandatory="no"/>             </itemgroupdef>             <itemgroupdef oid="ig03" name="f02-ungrouped" repeating="no" sasdatasetname="ungro002">                 <itemref itemoid="i05" ordernumber="1" mandatory="yes"/>                 <itemref itemoid="i06" ordernumber="2" mandatory="yes"/>             </itemgroupdef>         </metadataversion>     </study> </odm>