The index
section
element represents a major structural division of an
index
.
The index
section
element is a specialization of the
section
element that provides a content model to fit the unique requirements of index divisions.
The republishing of documents often requires the insertion of content that was not a part of the original source document.
For example, in the case of indexes, bibliographies and other ordered sections, this requirement may take the form of placeholder
sections to mark gaps in the alphabetic list of entries. To indicate that an element presents content that is a deviation
from the source, the
role
attribute can be used with the value
custom
. No behaviors are defined for how a processing agent should handle sections so identified, however.