HyTime attribute: Defines the roles of the anchors.
The 'anchrole' values differs between links, but it is always a fixed value that must not be changed. An application can build it's processing around anchor roles, but they have no other meaning in HyTime.
For further explanations, see the HyTime standard (ISO 10744), clause 9.2.1.
CDATA
HyTime attribute: Identifies the element or it's content as being significant to HyTime processing, and defines the corresponding HyTime architectural form
The HyTime values differs between elements, but it is always a fixed value that must not be changed.
For further explanations, see the HyTime standard (ISO 10744), clause 6.4.
NAME
Reference identity of the element.
Used to identify the element to enable referring by use of HyTime.
Due to the large number of required ID attributes, software for creating information modules should have the possibility to automatically generate ID values.
ID
HyTime attribute: Defines the link ends used by the link. Points to location elements (nameloc).
The ID values of the two nameloc elements used by the link must be entered in this attribute. There must always be two values, one corresponding to the first anchrole value, the second orresponding to the second achrole value.
For further explanations, see the HyTime standard (ISO 10744), clause 9.2.1.
IDREFS
Indicates whether the link should be preserved or updated when new versions are created
Freeze ("frys") would be appropriate when the second linkend is an element or an information fragment, or when a specific version or variant is referenced.
Update ("uppdatera") might be desirable for more generic links, e.g. to safety precautions, tools, etc., when the most current information is desired.
In both cases it is recommended that the application informs the author of the consequenses, and it should be possible to override this attribute in any specific instance of a link.