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[Chris Hillery <920721@xxxxxxxxxxxxxxxxxx>]

The JSON grammar is not as pedantic as I would like, but it looks like a
JSON text must be exactly an object or an array.

  http://tools.ietf.org/html/rfc4627

So an empty string is not a valid instance of JSON.

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https://bugs.launchpad.net/bugs/920721

Title:
  json 2.0 bug: wrong behavior for parsing empty value

Status in Zorba - The XQuery Processor:
  New

Bug description:
  Parsing an empty value has wrong behavior for both JSON mappings (Snelson and JSON-ML).
  Please see failing tests:
  - test/rbkt/zorba/json/json-snelson-empty-value
  - test/rbkt/zorba/json/json-jsonml-empty-value

  For instance in zorba/json/json-snelson-empty-value.xq:

  import module namespace json = "http://www.zorba-xquery.com/modules/converters/json";;
  json:parse(<a/>)

  Should raise error(s) http://www.zorba-xquery.com/errors:ZJPE0001
  But instead Zorba returns a result.

  
  For test/rbkt/zorba/json/json-jsonml-empty-value.xq:

  import module namespace json = "http://www.zorba-xquery.com/modules/converters/json";;
  let $options :=
    <options xmlns="http://www.zorba-xquery.com/modules/converters/json-options";>
      <json-format value="JsonML-array"/>
    </options>
  json:parse(<a/>,$options)

  Zorba returns http://www.w3.org/2005/xqt-errors:XPST0003
  instead of http://www.zorba-xquery.com/errors:ZJPE0001

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