[Chart] the grammar of graphics

[Tim Docker]

Hi,

In developing the API for the chart library, there's always been a 
tension between type-safety and flexibility, versus suitability for 
quick and easy use. The current API works fine, but there's still more 
syntax than I'd like to get a chart into a window.

People involved in data analysis and statistics, often cite various 
libraries as being pleasingly easy to use, (eg: http://ggplot2.org/) and 
these libraries often claim to be based upon this book:

http://www.amazon.com/Grammar-Graphics-Statistics-Computing/dp/0387245448

Has anyone looked at this book, or have an online reference to something 
describing it's key ideas? It's an expensive book to buy without knowing 
that it's going to be worthwhile.

Tim