help using my own scm modules

[Arun Kumar]

Hi,

I have quite a bit customizations done with scheme code that are directly in 
the .ly files. I would like to move almost all of it to a .scm file that is a 
new module. I have tried doing this by putting the scm file in a separate 
directory and set GUILE_LOAD_PATH env variable. 

But the trouble is my customizations include my own markup commands (def-
markup-command) and so initially i got the error that "def-markup-command" is 
unbound. I added a (use-modules (scm markup)) in my .scm file, and it looks 
like guile found markup.scm but now it complains "Unbound variable: 
Text_interface::interpret_markup". I cannot find a definition for it in scm 
and I presume this is actually in C/C++ code?

What am i doing wrong? How can i accomplish making my lilypond customizations 
as a scheme module or is this not possible?

Thanks
Arun