Component (Dexter) vs. Concept Component (AHAM)

The Dexter Component

• The Dexter component consists of both nodes and links
• The node is simply the pieces of text, images, videos, etc. that make up a hypertext network

The AHAM Concept Component

• The AHAM concept component (also more simply known as a "concept") is an abstraction of an information item
• The information item is a pair consisting of a globally unique id, and the component information itself
• The component information is made up of: a set of attribute-value pairs, a sequence of anchors, and a presentation specification
  

In a nutshell, the Concept Component embodies the Dexter Component, but is more robust in definition.

The Atomic Concept

• The atomic concept is the smallest piece of information. It is the primitive object in the model.
• This smallest piece of information is know as a fragment
• The content, and anchor values of the atomic concept exist only in the within-component layer

The Composite Concept

• The composite concept is a concept composed of a set of children
• Each level of children in a composite concept are either made up entirely of other composite concepts, or of atomic concepts
• A page is a composite concept consisting of nothing but composite concepts.