My experience with document interchange led me to classify document formats using the essential distinction that some are "programmable" and some are not. [..]
The reason that this distinction is essential with respect to document interchange is that extracting information from documents in "programmable" document formats is equivalent to the halting problem. That is, it is arbitrarily difficult and cannot be automated in a general fashion.
For example, I conjecture that it is impossible to write a program that will extract the third word from a TeX document. ·
Computer Science in the 1960s to 80s spent a lot of effort making languages which were as powerful as possible. Nowadays we have to appreciate the reasons for picking not the most powerful solution but the least powerful. The reason for this is that the less powerful the language, the more you can do with the data stored in that language. If you write it in a simple declarative from, anyone can write a program to analyze it in many ways. The Semantic Web is an attempt, largely, to map large quantities of existing data onto a common language so that the data can be analyzed in ways never dreamed of by its creators. ·
Tim O'Reilly attempts to clarify just what is meant by Web 2.0, the term first coined at a conference brainstorming session between O'Reilly Media and MediaLive International, which also spawned the Web 2.0 Conference. ·
We have identified ten principles that provide a lens to evaluate the extent to which government data is open and accessible to the public. The list is not exhaustive, and each principle exists along a continuum of openness. The principles are completeness, primacy, timeliness, ease of physical and electronic access, machine readability, non-discrimination, use of commonly owned standards, licensing, permanence and usage costs. ·