It is exactly three years back, and no real progress has been made concerning  this proposal to serialize MARC in JSON:

http://dilettantes.code4lib.org/blog/2010/09/a-proposal-to-serialize-marc-in-json/


Meanwhile new tools for searching and retrieving records have come in, such as Solr and Elasticsearch. Any ideas on how one could alter (or propose a new format) more suited to the mechanisms of these two search platforms?

Any example implemantations would be also really appreciated,

thank you in advance