Adding new markup is complicated*, I'd rather prefer a KISS approach, not least because of backwards compatibility.
The only possible targets in PM is <a name="anchor-name"> so adding a parser for a magic href #toc or #notoc would already do, i.e.
<a href="#toc" name="anchor-name">
A new markup <toc> should have a reasonable default behaviour
- nesting all H tags, unless excluded by linebreak
- adding all <a name=""> tags under the last H level
Any "filtering" features should be discussed after implementing and testing the first phase.
In a side note: There is a tendency to mangle the concept of "keywords" into this discussion.
IMHO that's mostly unrelated, first things first.
FWIW PM has already a keyword nodelet, but lacks a search engine for it...
*) actually I can't even locate the corresponding code, I'm volunteering to implement it if possible.
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