OpenSearch is a bad standard. It was written at Amazon and published as a 
“standard” with no consultation or committee. It was just “hey folks, we’re 
Amazon, so give us results the way we want them."

One example of badness is the “language” parameter, which says the search 
client desires search results in the desired language. Pretty fuzzy, but 
appears to mean filtering the documents to only those in that language. What 
about the language used to tokenize and lemmatize the query? What about the 
locale for that? What about other filters? Every search engine separates 
filtering and ranking queries.

What about specifying the syntax used for the query?

So, just junk. It is substantially inferior to the federated search we built at 
Verity (using SOAP, yuk).

If you want federated search, use GData. That is a pretty good design, even 
though Google has mostly moved on from it for their proprietary APIs.

https://developers.google.com/gdata/

wunder
Walter Underwood
wun...@wunderwood.org
http://observer.wunderwood.org/  (my blog)

> On Apr 26, 2019, at 6:20 PM, Erick Erickson <erickerick...@gmail.com> wrote:
> 
> None. See: https://issues.apache.org/jira/browse/SOLR-2143 and 
> https://issues.apache.org/jira/browse/SOLR-2419 for the last times I know of 
> that any consideration was given for supporting it and the reason why not.
> 
> Best,
> Erick
> 
>> On Apr 25, 2019, at 1:02 PM, DESDCS <daniel.s...@hrsdc-rhdcc.gc.ca> wrote:
>> 
>> What version of OpenSearch specification does Solr currently uses?
>> 
>> 
>> 
>> --
>> Sent from: http://lucene.472066.n3.nabble.com/Solr-User-f472068.html
> 

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