Although "lucene" syntax tends to be quite concise, nice looking, and easy to build by hand (the web browser is a major debugging tool for me), some people prefer to use a more "structured" query language that's easier to build up programmatically. XML fits the bill, but people tend to prefer JSON these days.
Hence my first quick prototype: https://issues.apache.org/jira/browse/SOLR-4351 I'm pretty happy so far with how easily it's fit in with our QParser framework, which should generally allow parsers to not care about the underlying syntax of queries they need to deal with. For example: the "join" qparser uses the query specified by "v", but doesn't care of it's in lucene syntax, or if it was part of the JSON. {'join':{'from':'qqq_s', 'to':'www_s', 'v':'id:10'}} {'join':{'from':'qqq_s', 'to':'www_s', 'v':{'term':{'id':'10'}}}} Note: replace the single quotes with double quotes before trying it out - these are just test strings that have the replacement done in the test code so that they are easier to read. There's a fair bit left to do of course... like how to deal with "boost", "cache", "cost", parameter dereferencing, etc. Feedback welcome... and hopefully this will be good to go for 4.2 -Yonik http://lucidworks.com
