anchor.diff:  nuget pack ..\Adapters\Kephas.Npgsql\Package.nuspec -BasePath ..\Adapters\Kephas.Npgsql -Symbols -properties Configuration=%BuildConfiguration%;Version=%PackageVersion%;RefVersion=%PackageRefVersion%
   
   @echo Done.
  -pause
  +@pause
   
  -goto :eof
  +@goto :eof
   :usage
   @echo Usage: %0 ^<version^> ^<ref-version^> [^<build-configuration^> = Debug]
   @echo version is the package version number
  
positive.code: @echo build-configuration is the build configuration used for packaging (default is Debug)
  
  :eof
  pause
  exit /B 1
negative.code: if [%1]==[] goto usage
  if [%2]==[] goto usage
  set BuildConfiguration=%3
  if "%BuildConfiguration%"=="" set BuildConfiguration=Debug
  
  set PackageVersion=%1
  set PackageRefVersion=%2
  