Okay DigiPresHiveMind, I have a question... I have a big pile of MARC XML. I don't know MARC, so unlike the experts I've worked with, I can't expand all these letters and codes in my head! Is there a library that will do some basic expansion of MARC into something I can understand? I realise this might be lossy, but some kind of Dublin Core or plain-old-CSV projection would be helpful!
@anj As someone who also doesn't do MARC but is fresh off a pair of library school metadata classesβ€”if you can find something to convert it to MODS, it will be fairly readable, and I believe such converters exist.
Online Bibliographic Metadata Tools

Free Online file conversion. Convert bibliographic metadata formats. Support for large file conversions.

@linguistory @anj I would also recommend MarcEdit for transformations and also just for looking at files if you want to start to see patterns. You can also export a subset of fields into a tab-separated value, which I find extremely helpful.

There are also some built-in transforms.

If you want reference, I recc: https://www.loc.gov/marc/bibliographic/index.html

Looking at other stuff in the thread pymarc's labeled fields are definitely helpful for just getting some basics out of each, which MarcEdit doesn't support.