@node Libguile overview
@chapter Libguile overview
@cindex libguile - overview

Extension languages, like Guile, Python and Tcl, can be embedded into a
C program, @footnote{Or a C++ or Fortran or Pascal program if you want.}
and thus allow the user to @emph{extend} the C program.

The way this is done is by providing a C language library with a well
defined interface.  The interface consists of a set of public and
documented C-callable routines that offer the full interpreter
functionality, and allow the conversion of data between C and the
extension language.

@menu
* An example of libguile functionality::  
* What can be done with libguile::  
* Schizofrenia -- two APIs::    
@end menu

@node An example of libguile functionality
@section An example of libguile functionality

[Two examples: using strings and using data conversion.]

@node What can be done with libguile
@section What can be done with libguile

@node Schizofrenia -- two APIs
@section Schizofrenia -- two APIs