On this page:
detail-page

7 Second Container: detail-page/detail-div

procedure

(detail-page proc    
  #:line_break_length? line_break_length?    
  #:font_size? font_size?)  any
  proc : procedure?
  line_break_length? : natural?
  font_size? : (or/c 'normal 'big 'small)
detail-page means when all it’s children detail statement done, it should start a new page.

detail-div same as detail-page, but not start a new page, just like html’s div, block container.

detail-page and detail-div is second level container, but all detail statements should be placed into its proc.