<itemgroup> element can be used to sub-divide or organize
elements that occur inside a list item, definition, or parameter definition.
<itemgroup>element is particularly useful as a basis for specialization, where it can be used to group content within specialized list items or definitions. For example, in the OASIS task specialization, many elements within the
<step>element are specialized from
See appendix for information about this element in OASIS document type shells.