[Haskell-cafe] (general question) Approaches for storing large amount of simple data structures

I have a project where I want to store a data structure on a file, binary or ascii. And I want to use haskell to read and write the file. I will have about half a million records so it would be nice if the format was able to load quickly. I guess I could, but I kind of want to avoid using XML. I have the following structure in pseudo code. A URL -> id -> keywords associated with that URL -> title associated with that URL -> links contained in that URL. (0 ... N) What is an approach for saving 500 thousand of those types of records and where I can load the data into a haskell data type. -- Berlin Brown [berlin dot brown at gmail dot com] http://botspiritcompany.com/botlist/?