<when>

<when> indicates a point in time either relative to other elements in the same timeline tag, or absolutely. [16.5.2 Placing Synchronous Events in Time]
Modullinking — Linking, Segmentation, and Alignment
Attributeatt.global (@xml:id, @n, @xml:lang, @rend, @style, @rendition, @xml:base, @xml:space) (att.global.linking (@corresp, @synch, @sameAs, @copyOf, @next, @prev, @exclude, @select)) (att.global.analytic (@ana)) (att.global.facs (@facs)) (att.global.change (@change))
absolutesupplies an absolute value for the time.
Zustand Optional
Datentyp 

<rng:ref name="data.temporal.w3c"/>
data.temporal.w3c
unitspecifies the unit of time in which the interval value is expressed, if this is not inherited from the parent timeline.
Zustand Optional
Datentyp 

<rng:ref name="data.enumerated"/>
data.enumerated
Empfohlene Werte sind:
d
(days)
h
(hours)
min
(minutes)
s
(seconds)
ms
(milliseconds)
intervalspecifies the numeric portion of a time interval
Zustand Optional
Datentyp 

<rng:ref name="data.interval"/>
data.interval
Werte a positive number, or the special value unknown.
sinceidentifies the reference point for determining the time of the current when element, which is obtained by adding the interval to the time of the reference point.
Zustand Optional
Datentyp 

<rng:ref name="data.pointer"/>
data.pointer
Werte Should point to another when element in the same timeline.
Mitglied des
Enthalten in
linking: timeline
Kann enthaltenLeeres Element
Deklaration

<rng:element name="when">
 <rng:ref name="att.global.attributes"/>
 <rng:ref name="att.global.linking.attributes"/>
 <rng:ref name="att.global.analytic.attributes"/>
 <rng:ref name="att.global.facs.attributes"/>
 <rng:ref name="att.global.change.attributes"/>
 <rng:optional>
  <rng:attribute name="absolute">
   <rng:ref name="data.temporal.w3c"/>
  </rng:attribute>
 </rng:optional>
 <rng:optional>
  <rng:attribute name="unit">
   <rng:choice>
    <rng:value>d</rng:value>
    <rng:value>h</rng:value>
    <rng:value>min</rng:value>
    <rng:value>s</rng:value>
    <rng:value>ms</rng:value>
    <rng:data type="Name"/>
   </rng:choice>
  </rng:attribute>
 </rng:optional>
 <rng:optional>
  <rng:attribute name="interval">
   <rng:ref name="data.interval"/>
  </rng:attribute>
 </rng:optional>
 <rng:optional>
  <rng:attribute name="since">
   <rng:ref name="data.pointer"/>
  </rng:attribute>
 </rng:optional>
 <rng:empty/>
</rng:element>
element when
{
   att.global.attributes,
   att.global.linking.attributes,
   att.global.analytic.attributes,
   att.global.facs.attributes,
   att.global.change.attributes,
   attribute absolute { data.temporal.w3c }?,
   attribute unit { "d" | "h" | "min" | "s" | "ms" | xsd:Name }?,
   attribute interval { data.interval }?,
   attribute since { data.pointer }?,
   empty
}
Beispiel
<when xml:id="TW3" interval="20" since="#w2"/>