- Supplementary question.
Can this be extended to find patterns defined using regular expressions ?
eg add to the above pattern file :
<group id="group-3">
<alarm equipment="MDU X[0-9]{4} Relay fail"/>
<alarm equipment="MDU X[0-9]{4} Fuse fail"/>
</group>

<group id="group-3">
<alarm equipment="MDU X([0-9]{4}) Relay fail"/>
<alarm equipment="MDU X([0-9]{4}) Fuse fail"/>
</group>

The result would be changed to add the following :

<area name="LAR 23">
<alarm equipment="MDU X2301 Relay fail" found="group-3" found-group="1" found-key="2301" />
<alarm equipment="MDU X2301 Fuse fail" found="group-3" found-group="1" found-key="2301" />

~/t/ftemp $ cat groups.xml
<groups>
<group id="group-1">
<alarm equipment="Frame 1 PSU 1"/>
<alarm equipment="Frame 1 PSU 2"/>
<alarm equipment="Fan Tray 1"/>
</group>
<group id="group-2">
<alarm equipment="1 Alarm"/>
<alarm equipment="2 Alarm"/>
<alarm equipment="3 Alarm"/>
</group>
<group id="group-3">
<alarm equipment="MDU X([0-9]{4}) Relay fail"/>
<alarm equipment="MDU X([0-9]{4}) Fuse fail"/>
</group></groups>~/t/ftemp $
~/t/ftemp $ cat robert.xml
<areas>
<area name="LAR 23">
<alarm equipment="1 Alarm"/>
<alarm equipment="3 Alarm"/>
<alarm equipment="MDU X2301 Relay fail"/>
<alarm equipment="2 Alarm"/>
<alarm equipment="MDU X2301 Fuse fail"/>
</area>
<area name="LAR 41">
<alarm equipment="MDU X4107 Relay fail"/>
<alarm equipment="MDU X4107 Fuse fail"/>
<alarm equipment="MDU X4108 Relay fail"/>
<alarm equipment="MDU X4108 Fuse fail"/>
<alarm equipment="Frame 1 PSU 1"/>
<alarm equipment="Frame 1 PSU 2"/>
<alarm equipment="Fan Tray 1"/>
</area>
<area name="LAR 51">
<alarm equipment="1 Alarm"/>
<alarm equipment="3 Alarm"/>
<alarm equipment="Frame 1 PSU 1"/>
<alarm equipment="Frame 1 PSU 2"/>
<alarm equipment="Fan Tray 1"/>
</area>
<area name="LAR 53">
<alarm equipment="1 Alarm"/>
<alarm equipment="2 Alarm"/>
<alarm equipment="Rack 5308 Power Fail Alarm"/>
<alarm equipment="Rack 5309 Power Fail Alarm"/>
<alarm equipment="3 Alarm"/>
</area>
<area name="LAR63">
<alarm equipment="MDU X6311 Relay fail"/>
<alarm equipment="MDU X6311 Fuse fail"/>
</area>
</areas>~/t/ftemp $
~/t/ftemp $ xslt2 robert.xml robert.xsl

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

<xsl:template match="alarm">
  <xsl:copy>
    <xsl:apply-templates select="@*"/>
    <xsl:variable name="thisAlarm" select="."/>
    <xsl:for-each select="$groupedAlarms
                          [matches($thisAlarm/@equipment,@equipment)]">
      <xsl:attribute name="found" select="../@id"/>
      <xsl:variable name="thisGroupedAlarm" select="."/>
      <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-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:copy>
</xsl:template>

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

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