a character strig of length one that references a page
style that is either contained in the style definitions or already
used within the document.
Details
This function should be called in a code chunk in an odfWeave document
at the point where a page break with a page style is desired.
A common use would be to change the page to landscape mode, perhaps
using the "RlandscapePage" style in order to display a table in
landscape mode, and then to set it back to the standard style
after generating the table.