First page number

The number of the first page of a sequence of contiguous pages. Mandatory in each occurrence of the <PageRun> composite, and non-repeating. Note that here and in the <LastPageNumber> element a page ‘number’ may be Arabic, Roman, or an alphanumeric string (eg L123).

Format
Variable length alphanumeric, suggested maximum length 20 characters
ReferenceName<FirstPageNumber>
ShortTag<b286>
Cardinality1
Example23