added function valid_main_definition
added function valid_main_definition

riginding/dora,dinfuehr/dora,dinfuehr/dora,riginding/dora,riginding/dora,riginding/dora,riginding/dora,dinfuehr/dora,riginding/dora,dinfuehr/dora,riginding/dora,dinfuehr/dora,dinfuehr/dora