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That made me wonder if there is something that uses an XPath like approach rather than CSS selectors, turns out there is just such a thing:

http://goessner.net/articles/JsonPath/

These tools could be fun for writing map functions for CouchDB.




You might want to check out RQL, which builds on JsonPath:

  http://www.sitepen.com/blog/2010/11/02/resource-query-language-a-query-language-for-the-web-nosql/




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