Models: Amsterdam - atomic

• The Amsterdam Hypertext Model (AHM) discusses nodes or components that are atomic, i.e., having only one media type.
• Presentation concerns how the information is rendered for the user and will depend on the channel used (e.g., which display, which audio speaker).
• Since AHM handles time-based presentations, the duration (e.g., length of an audio segment, or how long an image should be shown) or other indications (e.g., display till mouse is clicked) are recorded.
• Special presentation instructions also may be needed, such as volume or intensity adjustments.
• Attributes of data may include expiration date, format, compression method, image resolution, etc.
• Each anchor is assigned a local ID for this component, paired with some value, which is typically a pointer to its location or span, the coordinates of a button, etc.
• The contents of the component may be stored inside it, or in an external file or other special location in which a pointer or name is recorded.

Note that the Dexter representation is similar but omits presentation details about duration.