Adding high level source code constructs to a low level language. As opposed to other assemblers MACRO constructs that give a pseudo high level construct, Modern Assembler Language will have it built in.
I would _like_ to go for a C style language construct, but this may change over time.
nsL is a new C-like programming language for writing NSIS installation wizards (http://nsis.sourceforge.net). The nsL assembler takes nsL code and translates it into original NSIS script which can then be compiled.