rewritten to use xsltproc as external called programm to transform
  output. The path to xsltproc was hard encoded, because it is part of
  ExL rosetta rollout.
- HINT: the plugin could be tested as dps-user by calling:
  java -cp /exlibris/dps/d4_1/system.dir/dps-sdk-7.1.0/\
  lib/dps-sdk-7.1.0.jar:/exlibris/dps/d4_1/system.dir/dps-sdk-7.1.0\
  /dps-sdk-projects/dps-sdk-deposit/lib/log4j-1.2.14.jar:/exlibris/dps\
  /d4_1/system.dir/dps-sdk-7.1.0//dps-sdk-projects/dps-sdk-deposit/lib\
  /commons-codec-1.10.jar:/exlibris/dps/d4_1/system.dir/dps-sdk-7.1.0/\
  dps-sdk-projects/dps-sdk-deposit/lib/xmlbeans-2.3.0.jar:/usr/share/\
  java/commons-lang.jar:/operational_shared/plugins/custom/\
  SLUBTechnicalMetadataExtractorMediaConchPlugin.jar \
  org.slub.rosetta.dps.repository.plugin.SLUBTechnicalMetadataExtractorMediaConchPlugin \
  /permanent_storage/normal/2021/06/14/IE19503/V1-FL19505.mkv
  (for example on dev)