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description: allow accessing pipeline parameter “array values” by “index”.

get_pipeline_parameter_index_value
/parameter_name=
/parameter_value=
/index=
;

example

set_pipeline_parameter
/parameter_name=running_speed
/parameter_value=10 km/h+12 km/h+14 km/h
;

set_pipeline_parameter
/parameter_name=filenames
/parameter_value=filea + fileb + filec
;

for_each
/iteration_parameter_name=file
/iteration_parameter_count_name=increment
/items=filenames
;
  
   file_open
   /file_name=::file
   ;
  
   get_pipeline_parameter_index_value
   /parameter_name= scott
   /parameter_value=::running_speed
   /index=::increment
   ;

   assign_tags_to_files
   /motion_file_names=::file
   /tags=::scott
   ;
  
end_for_each
/iteration_parameter_name=file
;