Length and Size
This Tag Set has a single general purpose element <size> for recording the number of pages in a book, the showing time of a film, the number of kilo/mega/tera-bytes in a dataset, or any other measurement of size, length, or extent that may be recorded for a cited work.
The @units attribute must be used to state the units of measure, such as “pages”, “minutes”, “paragraphs”, “MB”, etc. A units value is typically given in the plural (“pages” not “page”).
The size element is assumed to contain the textual value of the size: