`<when>` | (when) indicates a point in time either relative to other elements in the same `<timeline>` tag, or absolutely.
Attributes: |
`absolute` | supplies an absolute value for the time.
| Datatype: CDATA
| Values: Times may be given in standard form, as specified in the Encoding Declarations section of the header.
| Default: #IMPLIED
Note | Required for the element designated as the value of the `origin` attribute in the `<timeline>` tag.
`unit` | specifies the unit of time corresponding to the `interval` value.
| Datatype: NMTOKEN
| Values: a semi-closed list of recognized time units such as ``millisecond'', ``second'', ``minute''
| Default: %INHERITED;
`interval` | specifies the numeric portion of a time interval
| Datatype: CDATA
| Values: -1 or any positive number
| Default: %INHERITED;
Note | The value -1 indicates uncertainty about the interval.
`since` | identifies 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.
| Datatype: IDREF
| Values: Should point to another `<when>` element in the same `<timeline>` .
| Default: #IMPLIED
Note | If this attribute is omitted, and the `absolute` attribute is not specified, then the reference point is understood to be the origin of the enclosing `<timeline>` tag.
`id` | supplies an identifier, unique to the document, for each `<when>` element.
| Datatype: ID
| Values: any valid name
| Default: #REQUIRED
Note |

Example

    <when id=w3 since=w2 interval=20>

Tagset additional tag set for
Class
Filename `teilink2.dtd`
Content: empty
Parents timeline
Children[none]
Declaration

    <!ELEMENT when          - O  EMPTY                              >
    <!ATTLIST when               %a.analysis
                                 %a.linking
                                 %a.terminology
              n                  CDATA               #IMPLIED
              lang               IDREF               %INHERITED

              rend               CDATA               #IMPLIED
              absolute           CDATA               #IMPLIED
              unit               NMTOKEN             %INHERITED;
              interval           CDATA               %INHERITED;
              since              IDREF               #IMPLIED
              id                 ID                  #REQUIRED      >

See 14.5.2

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