<
chapter
>
is a sequence of paragraph level elements mixed with
<
chapter
>
.
<
chapter
>
s can be nested as deeply as required. It is up to the author to make sure, that the nesting of the chapters can be handled by the processing system
.
Figure 113: chapter content model
One advantage of using
<
chapter
>
for all levels
is the option to move a chapter using
cut & paste
to any place in the document at any level.
the other option would be to have an extra element for each chapter level
In that respect, it is recommended to nest not more than four levels.