Contains the number of (a count of) pages that are contained within a referenced item, such as a book
| Value | Meaning |
|---|---|
| Number | Although the tag set cannot limit this attribute beyond letters, numbers, and special characters, validation beyond the DTD (for example, schema validation or Schematron validation) may constrain this attribute to a counting number (positive integer), for example “15”. |
| Restriction: This attribute must be specified if the element is used. | |