While working on the MARC support for PHP, Dan Scott asked for suggestions and feedback. Since it was few and far between, he spent the time on another task - working on the error handling for the package.
I've figured out (with Lukas and Pierre's assistance, merci beaucoup) how to make use of PEAR::ErrorStack for error handling. I've also decided to split my linked-list-in-PHP implementation into a separate package; first, because it might be useful for someone else; second, because as a separate package the PHP gurus that care deeply about things like returning references can go over it with a fine-toothed comb without having to worry about all of the MARC stuff.
In light of these new developments, he'as asking for comments once again on two different packages - Structure_Linked_List and File_MARC.