Æliens

Hypertext -- nodes and links

• non-linear text -- As we may think

 [Bush]

• virus $->$ infection

Hypermedia systems -- programmable media

• components -- text, graphics, audio, video
• links -- relations between components
• presentation -- structured display

WYSIWYG

• documents -- open, close
• blocks -- select, copy, paste
• links -- $source\; ->\; destination$

Classification of hypermedia systems

 [Conklin87]

• macro-literary systems -- publishing, reading, criticism
• problem exploration tools -- authoring, outlining, programming
• browsing systems -- teaching, references, information
• general hypermedia technology -- authoring, browsing, collaboration

• CASE, decision support, catalogs

Hypertext model -- documents

Dexter

• components, links and anchors

Component

• content -- text, graphics, video, program
• attributes -- semantic description
• anchors -- links to other documents
• presentation -- display characteristics

• children -- subcomponents

Multimedia model -- composition

CMIF

• data block -- atomic component
• channel -- abstract output device
• synchronization arc -- specifying timing constraints
• event -- actual presentation

• structure -- sequential and parallel composition
• channels -- presentation

Hypermedia model -- components

• contents -- data block
• attributes -- semantic information
• anchors -- $(id, value)$$
• presentation -- channel, duration, ...

• children -- $( component, start-time $)$
• synchronization -- $($source,\; destination$)$$

Links -- anchors

• << source, conditions, destination >>$$

• information retrieval -- HTML

Active documents

• text as scripts