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.