| Attribute | att.datable.w3c (@when, @notBefore, @notAfter, @from, @to) att.datable.iso (@when-iso, @notBefore-iso, @notAfter-iso, @from-iso, @to-iso) att.datable.custom (@when-custom, @notBefore-custom, @notAfter-custom, @from-custom, @to-custom, @datingPoint, @datingMethod) 
    | calendar | indicates the system or calendar to which the date represented by the content of this
        element belongs. | Zustand | Optional |  | Datentyp |  |  | He was born on <date calendar="#Gregorian">Feb. 22, 1732</date> (<date calendar="#Julian" when="1732-02-22"> Feb. 11, 1731/32, O.S.</date>).
 | 
 |  | period | supplies a pointer to some location defining a named
        period of time within which the datable item is understood to
        have occurred. | Zustand | Optional |  | Datentyp |  | 
 |  |