SD - Markup and OHCO Model

See writings of Coombs, DeRose, and their colleagues.

Markup Approaches

There are 6 types of markup:

• Punctuational
• Presentational (WYSIWYG)
• Procedural (Troff, TeX, LaTeX)
• Descriptive (GML, SGML)
• Referential (embed, include; SGML)
• Metamarkup (SGML)

OHCO

• Ordered Hierarchy of Content Objects
• A book is a good example of what can be represented this way.
• Each Content Object is marked at its beginning and end with a tag.
• Ordering is usually needed, but unordered sets are OK sometimes.