OurBigBook
You can only link to subsections of wiki pages with explicit links as in:
= History of Tiananmen Square
{{wiki=Tiananmen_Square#History}}
which looks like:

Ancestors

  1. \H wiki argument
  2. \H arguments
  3. Header
  4. Macro
  5. OurBigBook Markup
  6. OurBigBook Project