JobScheduler should use XSLT2 to transform e-mail stylesheets

Current Situation

• The xsl stylesheet ./config/scheduler_mail.xsl is used to create the body of JobScheduler e-mails.
• With <xsl:value-of select="/scheduler_event/@time"/> the time of event can be included into the e-mail body. The value is based on UTC.
• To convert UTC timestamps to local time of the JobScheduler Master server, it should be possible to use e.g.

   <xsl:value-of select="adjust-time-to-timezone( xs:time('20:45:00.0+01:00'), xs:dayTimeDuration('PT1H') )"/>
  

  which is only available with XSLT 2.

Desired Behavior

• JobScheduler should use a compatibe XSLT 2 library to provide the option to use functions as e.g. adjust-time-to-timezone.
• The time of the event that is stated with the JobScheduler e-mail should consider daylight saving times.

Workaround

• Download a current Saxon XML parser 9.8
• Stop the JobScheduler Master
• Replace the existing Saxon-HE-9.5.1-5.jar by the newer version Saxon-HE-9.8.0-4.jar in your ./lib/3rd-party directory.
• Modify Java options in ./config/factory.ini to include a property for use of the Saxon XML parser.

  [java]
  options                 = -Djavax.xml.transform.TransformerFactory="net.sf.saxon.TransformerFactoryImpl" -Dlog4j.configuration="file:///${SCHEDULER_HOME}/lib/log4j.properties"
  

• Replace the existing scheduler_mail.xsl stylesheet by the attached version of scheduler_mail.xsl.
• Restart JobScheduler.
• Your e-mail output of JobScheduler mails should now include the timestamp for events in the timezone of the JobScheduler Master server.