[Monetdb-developers] About MonetDB's modules

Hello, I am PhD student at EPFL, Switzerland, and I am working on database replication. I just started looking at MonetDB and I have a simple doubt. Are modules like the SQL module written in MIL or in C/C++? I downloaded the sources of the SQL front end and I found some files whose extension is ".mx" and which seem to implement the SQL translator into MIL. The code looks pretty much like C++. Moreover, I read somewhere in your web page that two-phase-locking is implemented outside the database kernel. Where exactly is it implemented for the SQL front end? Thank you very much in advance! Best regards, Rodrigo Schmidt