MarkLogic XML to JSON conversion

Question

I am trying to convert this XML file into JSON but unable to get any success. I have two child element in my XML but it is returning only last one. How to get both the records in JSON format?

XML

 <Carousel>
  <Video>
    <Title>1</Title>
    <Abstract>3</Abstract>
    <FileName type="custom" mediatype="image">D</FileName>
    <HasAccess>4</HasAccess>
  </Video>
  <Video>
    <Title>1</Title>
    <Abstract>2</Abstract>
    <FileName type="custom" mediatype="image">D</FileName>
    <HasAccess>3</HasAccess>
  </Video>
</Carousel>

XQUERY:

import module namespace json = "http://marklogic.com/xdmp/json"  at "/MarkLogic/json/json.xqy";

let $custom := let $config := json:config("custom")
           return 
             (
              map:put( $config, "whitespace", "ignore" ),

              $config
             )
let $XML := $XMLFile (: XML content :)
return json:transform-to-json($XML,$custom)

Current OUTPUT:

{"Carousel":{"Video":{"Title":"1", "Abstract":"2", "FileName":{"type":"custom", "mediatype":"image", "_value":"D"}, "HasAccess":"3"}}}

I also tried it with default "Basic" JSON setting json:transform-to-json($XML) but got error like

XML Element not in expected namespace [http://marklogic.com/xdmp/json/basic] (json:INVALIDELEM): Carousel

It works in "Full" mode only, but it is adding some extra information in JSON format like _attribute etc. which is not required in my output JSON.

Please help me or give any idea why it is not returning complete output in JSON format.

grtjn grtjn · Accepted Answer · 2014-11-11T13:36:47

You will need to mark repeating elements as array-elements for starters. This seems to work:

xquery version "1.0-ml";

import module namespace json = "http://marklogic.com/xdmp/json" at "/MarkLogic/json/json.xqy";

let $xml := <Carousel>
  <Video>
    <Title>1</Title>
    <Abstract>3</Abstract>
    <FileName type="custom" mediatype="image">D</FileName>
    <HasAccess>4</HasAccess>
  </Video>
  <Video>
    <Title>1</Title>
    <Abstract>2</Abstract>
    <FileName type="custom" mediatype="image">D</FileName>
    <HasAccess>3</HasAccess>
  </Video>
</Carousel>

let $custom :=
  let $config := json:config("custom")
  let $_ := map:put( $config, "whitespace", "ignore" )
  let $_ := map:put( $config, "array-element-names", "Video" )
  return $config

return json:transform-to-json($xml,$custom)

You can probably also suppress attributes if you like. The config supports all kinds of options, I recommend looking at its documentation:

http://docs.marklogic.com/json:config

HTH!

MarkLogic XML to JSON conversion

2 Answers