Hi List, As the subject indicates I am interested in the Boost.Phoenix project for this years summer of code. At first, a little information on me. I am currently studying at University of Erlangen-Nuremberg in Germany. I am learning C++ since 2005. I have experience with Expression Templates. I used them as part of my bachelors thesis: http://www10.informatik.uni- erlangen.de/Publications/Theses/2009/Heller_BA09.pdf Some months ago I discovered the Boost.Proto library. I was trying to implement a DSEL for a GUI description language. This attempt can be found here: http://gitorious.org/phobos/main/trees/c014102b5aefb2592eef625047340fa92d854... However this approach was not continued, and I developed a spirit parser which gives more flexibility in that particular domain. I like the idea of Boost.Phoenix as it is right now. I think an implementation with Boost.Proto seems only natural. I searched the boost SVN repository but i couldn't find the prototypes you mentioned. A link to these would be helpful to be able further look into this project proposal. Regards, Thomas Heller