Open standard(s) for browse info?

Are there (one or more) open, stable, widely supported formats for
source browse information, i.e. recording the locations in source code
where identifiers are defined and used? An open analogue to, say,
Microsoft's .bsc as opposed to .pdb.


I realise a browse format could be built around an open debug format
like DWARF, but I was hoping to find something designed specifically
for browsing and cross-referencing rather than general debugging.
[I suppose there's the format of the tags file that emacs or vi uses.
-John]

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