`[title[An Example]]` can be shortened to `[[An Example]]`, because <<.op title>> is the default filter operator. Consequentially, `[!title[An Example]]` can be shortened to `[![An Example]]`.
<<.op title>> is a [[constructor|Selection Constructors]] (except in the form `!title`), but <<.olink2 "field:title" field>> is a [[modifier|Selection Constructors]].