To be able to refer to parts of a document it should be possible to place an anchor at the position to reference so elsewhere a document can link to it.

E.g.
@anchor Foo

will result in
<a name="Foo"></a>

and can be referred to with #Foo

It's not a high priority, the markdown parser does allow <a name="Foo"></a> html but falling back to html is something that should be avoidable.