att.duration.iso

att.duration.iso attributes for recording normalized temporal durations. 3.5.4 Dates and Times 13.3.6 Dates and Times
Module namesdates — 13 Names, Dates, People, and Places
Members att.duration [date gap recording time]
Attributes In addition to global attributes
dur-iso (duration) indicates the length of this element in time.
Status Optional
Datatype 

<rng:ref name="data.duration.iso"/>
data.duration.iso
Note
If both when and dur or dur-iso are specified, the values should be interpreted as indicating a span of time by its starting time (or date) and duration. In order to represent a time range by a duration and its ending time the when-iso attribute must be used.
In providing a ‘regularized’ form, no claim is made that the form in the source text is incorrect; the regularized form is simply that chosen as the main form for purposes of unifying variant forms under a single heading.