""

"In my first shot at MARC-in-JSON, which I appropriately (and prematurely) named MARC-JSON, I made a point of losing round-tripability (to and from MARC) in order to end up with a nice, easy-to-work-with data structure based mostly on hashes. “Who really cares what order the subfields come in?” I asked myself. Well, of course, it turns out some people do. Some even care about the order of the tags. “Only in the 500s…usually” I was told today. All my lovely dreams of using easy-to-access hashes up in so much smoke."

"Even the smallest change in the original document will result in a new hash value. " MAY, they should say--just makes forgery DIFFICULT, not impossible

32-character hexadecimal number