`<timeline>` | (timeline) provides a set of ordered points in time which can be linked to elements of a spoken text to create a temporal alignment of that text.

Attributes:

`origin` | designates the origin of the timeline, i.e. the time at which it begins.
| Datatype: IDREF
| Values: must point to one of the `<when>` tags in its content.
| Default: #REQUIRED
Note | If the time of the origin is not known, it should be given an absolute value in descriptive terms, e.g. ``sometime on the night of the murder'' or ``unknown''.

`unit` | specifies the unit of time corresponding to the `interval` value of the timeline or of its constituent points in time.
| Datatype: NMTOKEN
| Values: a semi-closed list of recognized time units such as ``millisecond'', ``second'', ``minute''.
| Default: #IMPLIED
`interval` | specifies the numeric portion of a time interval
| Datatype: NUTOKEN
| Values: -1 or any nonnegative number
| Default: #IMPLIED

Note

The value -1 indicates uncertainty about all the intervals in the timeline; 0 indicates that all the intervals are evenly spaced, but the size of the intervals is not known; positive values indicate evenly spaced values of the size specified. If individual points in time in the timeline are given different values for the `interval` attribute, those values locally override the value given in the timeline.

Example

    <timeline id=tl1 origin=w0 unit=centisecond>
      <when id=w0 absolute='sometime Monday morning before Christmas'
      <when id=w1 since=w0 interval=-1>
      <when id=w2 since=w1 interval=10>
      <when id=w3 since=w2 interval=20>
      <when id=w4 since=w3 interval=15>
      <when id=w5 since=w4 interval=25>
      <when id=w6 since=w5 interval=10>
      </timeline>

Note

Occurs where??

Tagset additional tag set for
Class metadata [and indirectly also:] globincl
Filename `teilink2.dtd`
Content: one or more points in time, one of which is its origin
Parents[none]
Children when
Declaration

    <!ELEMENT timeline      - -  ((when)+)                          >
    <!ATTLIST timeline           %a.global
              origin             IDREF               #REQUIRED
              unit               NMTOKEN             #IMPLIED
              interval           NUTOKEN             #IMPLIED       >

See 14.5.2

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