- because issues in class loading in Rosetta, the working code was

  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)