The document discusses the concept of hypertext and link-based writing as envisioned by Vannevar Bush and further developed by Ted Nelson in his Xanadu project. It explains that hypertext allows for non-sequential writing through links, with documents having both in-links from other documents and out-links to other documents. The Xanadu system aimed to represent the true structure of information through this linked document model while providing simple interfaces for users.

1. Von Theodor Holm Nelson
exzerpiert für die Webwissenschaften
von H. Mittendorfer

2. Memex 1/49
V. Bush: „As We May Think“
V. Bush: „As We May Think“
• Indexing: When data of any sort are
placed in storage, they are filed
alphabetically or numerically.
• Information is found, by tracing it down
from subclass to subclass.
• The human mind does not work that
way. It operates by association.

3. Literature 2/9
• A literature is s system of interconnected writings
• The way people read and write is based in large part
on interconnections
• The Web of Connections in Science: She reads
current articles .. These articles refer back .. to other
writings .. is following links .. and refers to them ..
• Our Western cultural tradition is a great procession
of writings, all with links implicit and explicit
between them.

4. Non-sequential Writing 2/25
• The link facility gives us more than
the attachment ..
• It permits fully non-sequential
writing, or hypertext.

5. Links 3/23
• A link may be thought of as a jump
opportunity, like a conventional
footnote.
• If the author wants, such opportunities
become part of the text structure.
• If you (the reader) don’t like it there, hit
some sort of Return Button.

6. In-links, Out-links 2/31
• Ordinarily a document
consists of contents
(including history and
alternatives) and its out-
links.
• In-links are those stored
elsewhere which point
to it.

7. Historical Backtrack 2/25

8. Design 2/5
• The structure of documents and links to
be described here is, for a computer
system, unusually simple.
• The user has no direct contact with
technicalities.

9. Front End - Back End 2/7
• What we will discuss
here is representing the
true structure of a
certain kind of
Information (in the Back
End), not how to show
it (on the Front End)

10. Xanadu™3/4
• The Xanadu™Hypertext System is a
new form of storage intended to
simplify and calrify computer use, and
make possible new forms of
instantaneous electronic publication.

11. Xanadu Document Model (Q3)

12. Transpublishing (Q4)

13. Transcopyright (Q4)