- was designed to describe data and focus what data is.
- XML's design goals emphasize simplicity, generality, and usability over the internet.
- Although the design of XML focuses on documents, it is widely used for the representation of arbitrary data structures, for example in web services.
- is a markup language much like HTML.
- tags are not predefined.
1) XML syntax
2) XML tree
3) XML table
|Method||Molecular mechanics||Semi empirical||Ab initio|
|Speed||Very fast speed||Fast speed||Slow speed|
|Accuracy||Parameter restriction||Good accuracy||Very good accuracy|