Formal specification for file format used by load/save?

[Rui Maciel]

Is there any formal specification that describes the formats supported/used by 
Octave's load and save routines?  I've tried to write a couple of routines 
which dumped matrices and vectors to a file so that I could import them in 
Octave but sometimes (and not always) the code generated by them leads Octave 
to throw an "error: load: failed to load matrix constant" error.


Thanks in advance,
Rui Maciel