RE: [xsl] Pattern Matching in XSl - find groups defined in one Xml in another Xml.

Subject: RE: [xsl] Pattern Matching in XSl - find groups defined in one Xml in another Xml.
From: "Kerry, Richard" <richard.kerry@xxxxxxxx>
Date: Wed, 29 Aug 2012 16:16:27 +0000
Regarding Ken's solutions from last Wednesday (repeated below), why is it :

<xsl:analyze-string select="$thisAlarm/@equipment"
regex="^{$thisGroupedAlarm/@equipment}$">
<xsl:matching-substring>
<xsl:for-each select="regex-group(1)[normalize-space(.)]">
<xsl:attribute name="found-key" select="."/>
</xsl:for-each>
</xsl:matching-substring>
</xsl:analyze-string>

rather than

<xsl:analyze-string select="$thisAlarm/@equipment"
regex="^{$thisGroupedAlarm/@equipment}$">
<xsl:matching-substring>
<xsl:attribute name="found-key" select="regex-group(1)"/>
</xsl:matching-substring>
</xsl:analyze-string>

?

What does the [normalize-space(.)] predicate do for us ?


Uncertainly,
Richard.

PS.
By the way, this does seem to give the right results.
I'm only now getting back to looking at it and working out how it works,
having had a few days off over the (UK) Bank Holiday weekend.





Richard Kerry
BNCS Engineer
T: +44 (0)20 82259063
M: +44 (0)7812 325518
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________________________________________
From: G. Ken Holman [g.ken.holman@xxxxxxxxx] on behalf of G. Ken Holman
Sent: 22 August 2012 18:29

~/t/ftemp $ cat richard.xsl
<?xml version="1.0" encoding="US-ASCII"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                 version="2.0">

<xsl:output indent="yes"/>

<xsl:variable name="groupedAlarms"
               select="doc('groups.xml')/groups/group"/>

<xsl:template match="area">
   <xsl:copy>
     <xsl:apply-templates select="@*"/>
     <xsl:variable name="thisAlarmArea" select="."/>
     <!--find all alarm groups where every group member is in the alarm-->
     <xsl:variable name="foundGroups" select="$groupedAlarms
         (:there can be no mis-matches:)
         [every $groupAlarm in alarm satisfies
              some $areaAlarm in $thisAlarmArea/alarm
                 satisfies matches( $areaAlarm/@equipment,
                                    concat('^',$groupAlarm/@equipment,'$'))]"
/>
     <!--walk through the area alarms, annotating those that are found in
         the found groups (ignoring those groups where not all were found)-->
     <xsl:for-each select="alarm">
       <xsl:copy>
         <xsl:apply-templates select="@*"/>
         <xsl:variable name="thisAreaAlarm" select="."/>
         <!--only bother looking through the found groups, not others-->
         <xsl:for-each select="$foundGroups">
           <xsl:for-each select="alarm[matches($thisAreaAlarm/@equipment,
                                               concat('^',@equipment,'$'))]">
             <!--found the grouped alarm that the area alarm matches-->
             <xsl:variable name="thisGroupedAlarm" select="."/>
             <xsl:attribute name="found" select="../@id"/>
             <xsl:analyze-string select="$thisAreaAlarm/@equipment"
                                 regex="^{$thisGroupedAlarm/@equipment}$">
               <xsl:matching-substring>
                 <xsl:for-each select="regex-group(1)[normalize-space(.)]">
                   <xsl:attribute name="found-group">
                     <xsl:number select="$thisGroupedAlarm"/>
                   </xsl:attribute>
                   <xsl:attribute name="found-key" select="."/>
                 </xsl:for-each>
               </xsl:matching-substring>
             </xsl:analyze-string>
           </xsl:for-each>
         </xsl:for-each>
       </xsl:copy>
     </xsl:for-each>
   </xsl:copy>
</xsl:template>

<xsl:template match="@*|node()"><!--identity for all other nodes-->
   <xsl:copy>
     <xsl:apply-templates select="@*|node()"/>
   </xsl:copy>
</xsl:template>

</xsl:stylesheet>~/t/ftemp $
~/t/ftemp $


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