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Thanks for the Internet Archive pointer. Hadn't thought of it (probably because of a few past unsuccessful attempts to find archived pages.) Tried BadgerFish ( http://libx.lib.vt.edu/services/code4lib/lccnrelay3/2004022563 which proxies lccn.loc.gov's marcxml) and it meets the requirements of faithful reproduction of the XML, albeit in a very verbose way that doesn't attempt to do any minimization. That leaves, indeed, two independent problems: a) a free converter to GData's JSON format or another less redundant convention than badgerfish. Looking at this for 1 second, I'm wondering if this is even possible to implement without knowing the schema of the XML document. It says, for instance, to use arrays [] for elements that may occur more than once. b) something MARC-specific to express MARC records in JSON. I talked to Nathan Trail from LOC at code4lib, and they're revamping their lccn server this year to scale up and also serve more formats. Presumably, this effort could lead to a de-facto standard of how to serve MARC in JSON. Thinking out loud about this for a minute, I'm wondering if part a) is really a worthwhile goal. Aside from the impromptu prototyping of an XML-to-JSON gateway, I don't see any production use for a XML to JSON converter that is agnostic to the schema; for performance reasons alone. - Godmar