Sorry about the extra layer of indirection here. But if you'll kindly click on the following link, you'll find much more information on e4graph.
http://e4graph.sourceforge.net/
I have been able now to link this code with STL using the same methods I discuss in STL and Metakit.
e4Graph now has an interface to input and output information from the database in XML. This is accessible both from C++ and Tcl.
I am also working on an interface where a FORTRAN program can access an e4Graph database, using the Salford compilers for FORTRAN and C++. See also Platform Notes -- John Fletcher
June 2003 I am now looking at an interface from Ruby to E4Graph. -- John Fletcher