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
Indicates that the content of this element is found elsewhere
This attribute is used to indicate that the content of this element is found elsewhere. This is especially useful to avoid duplicating information, and a controlled use of this attribute is recommended.
The value given to this element has no meaning in SGML or HyTime, other than to indicate that a link from this element to the content has been established in the linking module (a 'lnk.inf.fragm'). Such a link must always exist if this attribute is given a value.
Any value here is supposed to trigger the inclusion of the content.
The other attributes for this element is used for the referenced content, and the attributes at the target element is neglected (except if the "ihref" attribute is used for that element, in which case the content reference continues). Elements contained in the referenced content do however keep their attribute values as is, which means that the ID attributes might possibly conflict, if and when the link is resolved in batch mode and a resulting file created. To avoid this, ensure that all ID's for the material system are unique (this is not a requirement, however).
If used, this element must be empty and must not have an end tag.
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