The "lacuna" style of navigational gadgets, a plain text style with no navigational features at all.

• §1. Creation
• §2. Top

§1. Creation.

navigation_design *Lacuna::create?Usage of Lacuna::create:
Navigational Designs - §1(void) {
    navigation_design *ND = Nav::new(I"lacuna", FALSE, TRUE);
    METHOD_ADD(ND, RENDER_CHAPTER_TITLE_MTID, Lacuna::lacuna_chapter_title);
    METHOD_ADD(ND, RENDER_SECTION_TITLE_MTID, Lacuna::lacuna_section_title);
    return ND;
}

§2. Top. At the front end of a section, before any of its text.

void Lacuna::lacuna_chapter_title?Usage of Lacuna::lacuna_chapter_title:
§1(navigation_design *self, text_stream *OUT, volume *V, chapter *C) {
    WRITE("%S\n\n", C->chapter_full_title);
}

void Lacuna::lacuna_section_title?Usage of Lacuna::lacuna_section_title:
§1(navigation_design *self, text_stream *OUT, volume *V, chapter *C, section *S) {
    WRITE("\n%c%S\n\n", SECTION_SYMBOL, S->title);
}