11 .. header:: The document header is once only.
13 .. footer:: And the document footer.
18 Some elements may contain only #PCDATA. They need to propagate changes
19 up. These are the references of [CITA]_ and footnotes [1]_.
24 Other elements may occur only once and thus need to propagate their
27 * Titles and subtitles of any kind
29 See this section and document title / subtitle
33 They have no children which could change.
35 * Parts of definition lists
41 Definition of term is also only once
43 * Parts of field lists
45 :Only once: Some content
47 :Another field: Field body is also only once
49 * The attribution of a citation
59 The caption of a figure
63 * Several parts of a table
73 Also colspec, thead and tbody but they are ignored here.
75 PCDATA *and* only once
76 ======================
78 Some elements are of both types.
80 --option A changing option_string must propagate to option
82 -o, --option_group The option_group and the description may also appear
85 .. [CITA] The label of a citation.
87 .. [1] The label of a footnote.