The Sort/Merge (SOR) routines allow you to integrate a sort or
    merge operation into a program application. Using these callable
    routines, you can process records, sort or merge them, and then
    process them again.

  Additional Information (explode) :

• SOR$BEGIN_MERGE
• SOR$BEGIN_SORT
• SOR$DTYPE
• SOR$END_SORT
• SOR$PASS_FILES
• SOR$RELEASE_REC
• SOR$RETURN_REC
• SOR$SORT_MERGE
• SOR$SPEC_FILE
• SOR$STAT