The post-processors for groff output are quite complex. Similar to the HTML postprocessor, labels and references need to be fixed and a table of contents must be created. Furthermore, groff and its macros require an unusually strict and unreadable input (well, in my opinion they do). The complexity of the groff conversions lies therefore in the post-processor. The labels and references are resolved via a post-processor which is similar to the HTML postprocessor: the .yodltagstart. and .yodltagend. strings, though in uppercase, are reserved. The converters also introduce an extra internal label for usage in the table of contents generation: .yoldtoccommand.. An in-depth description of the post-processor would be beyond this document. The post-processor is a C program yodlfixlabels.
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