Documents are containers for content and are referred to as Segments. A document is comprised of the document item itself, also called a Segment, and content. A single instance of content is a Node item (where the content data is surfaced) and a Shared Item. The two specific relationship pairs used in this item configuration are Contains/Contained By and References/Referenced By.

Together, these items and relationships create a document model which controls the behavior of documents and content modified by users across and between domains. A domain is an area of discipline or other logical grouping of like documents, for example, Requirements Management and Test Management.

The following graphic illustrates how Segments, and Nodes/Shared Items relate to each other in a document model: