IDs that start with an underscore _ are reserved for OurBigBook usage, and will give an error if you try to use them, in order to prevent ID conflicts.
For example:
  • the table of contents uses an ID _toc the ID of the ToC is always fixed to toc. If you try to use that for another element, you will get the following error:
  • elements without an explicit ID may receive automatically generated IDs of type _1, _2 and so on
If you use a reserved ID, you will get an error mesasge of type:
error: tmp.bigb:3:1: IDs that start with "_" are reserved: "_toc"


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