DESCRIPTION: Items are themselves members of the TIU TEMPLATE FILE, and vary according to the type of the item parent.
A container (type C, P, or R) holds templates (TEMPLATES and GROUP TEMPLATES) as its items. It may also hold other containers as items.
A GROUP TEMPLATE is made up of TEMPLATES or of other GROUP TEMPLATES as items. Its boilerplate text is a composite consisting of, first, it own boilerplate text if it has any, and then the boilerplate text of its items,
in SEQUENCE order. (See also field EXCLUDE FROM GROUP BOILERPLATE.) A GROUP TEMPLATE may also have a container (type C) as an item. In this case, the container is simply being stored in the GROUP TEMPLATE; the
container is ignored when the GROUP TEMPLATE is used for composing a document.
A TEMPLATE (type T) does not have items.
A given template or container may occur as an item in more than one tree, and may even occur more than once in the same tree. It cannot, however, be an item under itself. Nor can it occur twice, as an item of the same
NOTES: XXXX--CAN'T BE ALTERED EXCEPT BY PROGRAMMER