Holds the value of the identifier of an associated element; used for linking related elements (for example, <term> to a <def>, <bio> to a <contrib>).
| Value | Meaning |
|---|---|
| An identifier (IDREF) | Points to the existing identifier |
| Restriction: This attribute may be specified if the element is used. | |
| Value | Meaning |
|---|---|
| One or more identifiers (IDREFS) | Points to one or more existing identifiers. |
| Restriction: This attribute may be specified if the element is used. | |