The main section is part of a 'SRT' (see
´Search and Replace Tool (SRT)´) conversion (in fact the main section S is replaced by "*=S" and the SRT is started on an empty string). That means:
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All simple 'text' is written to the output file.
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All references '*([ref][:|#modifier])' are replaced by the [modified] value of the reference
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All lines containing the word '$$DELETE_LINE$$' are deleted.
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Lines ending with a \ are joined with the next line.