Hello,
for a new user to the diagram package some examples would be important. However,
the examples provided with this package are useless, because they either
- don't pertain to this package at all (draw_circle.tcl), or
- require a differently named package (package require Diagrams - all others), and
- assuming that just the package name changed and changing to the new name
(diagram), they contain commands like 'currentpos', 'plaintext' or 'usegap'
(draw_fraction.tcl) or 'attach' (draw_arrow.tcl) which don't even exist in
this package (any more?).

Summary: These examples were written for a sufficiently different package as to
be useless.
Thank you
Helmut Giese