[MarkLogic Dev General] Using Json Extensions

Danny Sokolsky Danny.Sokolsky at marklogic.com
Wed Mar 14 16:37:04 PDT 2012

And here are a few more examples in the documentation:



From: general-bounces at developer.marklogic.com [mailto:general-bounces at developer.marklogic.com] On Behalf Of Justin Makeig
Sent: Wednesday, March 14, 2012 3:36 PM
To: MarkLogic Developer Discussion
Subject: Re: [MarkLogic Dev General] Using Json Extensions

Are you trying to convert XML to JSON? In your example, you're calling fn:data() on the XML input. fn:data returns the atomic value of whatever you give it. In your case, you get back the text of all of your nodes as a single string. Calling xdmp:to-json on a string returns that string. In order to create nested JSON structures with xdmp:to-json, you'll have provide it map:map instances <http://developer.marklogic.com:8040/5.0doc/docapp.xqy#search.xqy?query=map%3Amap<http://developer.marklogic.com:8040/5.0doc/docapp.xqy#search.xqy?query=map:map>>. Translating XML structures to JSON in the general case is actually pretty tricky business. Today, there's an open-source, community-supported library called mljson <https://github.com/marklogic/mljson> that provides some conversion capabilities. You might take a look at that. If the structure of the XML you're converting into JSON is pretty predictable you might consider building a custom translation either into map:map or a raw JSON string using XSLT or XQuery. We're also looking to improve the built-in JSON support in MarkLogic as well. If you could provide some more details on what you're trying to accomplish others on this list or I may be able to help more.


Justin Makeig
Senior Product Manager
MarkLogic Corporation
justin.makeig at marklogic.com<mailto:justin.makeig at marklogic.com>
Phone: +1 650 655 2387

On Mar 14, 2012, at 2:56 PM, Jonathan Cook - FM&T wrote:

But what comes out isn't Json?


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Venice2012-01-17T22:56:44+00:00Risks of Italy's austerity measures2012-02-13T14:49:36+00:00Germany looks on the bright side2012-02-14T10:31:55+00:00Greek recession deepens in 2011STYC&W Worldwide shares in new leapShares in Cable & Wireless Worldwide (CWW) jump sharply for the second time in three weeks on hopes of a takeover battle.2012-03-01T12:48:56+00:002012-03-01T13:05:05+00:00en-GBModemSTYEurotunnel swings back to profitEurotunnel, the operator of the Channel Tunnel, returned to profit in 2011 with a record 19 million passengers.2012-03-01T12:50:23+00:002012-03-01T12:55:05+00:00en-GB2011-03-04T08:26:59+00:00Eurotunnel reports 57m euro loss"

-----Original Message-----
From: general-bounces at developer.marklogic.com<mailto:general-bounces at developer.marklogic.com> on behalf of Will Thompson
Sent: Wed 14.03.2012 21:12
To: MarkLogic Developer Discussion
Subject: Re: [MarkLogic Dev General] Using Json Extensions


That's is how xdmp:to-json works for XML nodes.



From: general-bounces at developer.marklogic.com<mailto:general-bounces at developer.marklogic.com> [mailto:general-bounces at developer.marklogic.com] On Behalf Of Jonathan Cook - FM&T
Sent: Wednesday, March 14, 2012 2:00 PM
To: MarkLogic Developer Discussion
Subject: [MarkLogic Dev General] Using Json Extensions


Has anyone successfully got the json extensions working, I have been playing around with the below but you don't get json coming out, just a long string of the element values from the xml?


let $newsml := doc('http://www.bbc.co.uk/asset/b5c53243-e52f-e059-e040-850a02846523/highweb/domestic')
return xdmp:to-json(fn:data($newsml))
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