#subobject triplets are correctly displayed and reused in formats such as broadtable or category but fails on other export formats.

{{#ask:[[Reference::fluit2003ontology]]|?Author|?Title|?Year|format=json|headers=show|link=all}}

JSON export fails with ->

{
"properties": {

		"author" : { "valueType": "text" },
		"title" : { "valueType": "text" },
		"year" : { "valueType": "text" }

},
"items": [

]
}

RDF export fails with ->

<rdf:RDF
xmlns:rdf="&rdf;"
xmlns:rdfs="&rdfs;"
xmlns:owl ="&owl;"
xmlns:swivt="&swivt;"
xmlns:wiki="&wiki;"
xmlns:property="&property;">

<owl:Ontology>

		<swivt:creationDate rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2012-02-29T00:34:24+01:00</swivt:creationDate>
		<owl:imports rdf:resource="http://semantic-mediawiki.org/swivt/1.0"/>

</owl:Ontology>
<owl:DatatypeProperty rdf:about="http://semantic-mediawiki.org/swivt/1.0#creationDate" />
<!-- Created by Semantic MediaWiki, http://semantic-mediawiki.org/ -->
</rdf:RDF>

RSS export fails -> empty content

CSV export fails -> only contains of headers

Bibtex export fails -> export file completely empty

Tested on MediaWiki 1.18.0, PHP 5.3.8 (apache2handler), MySQL 5.5.16 Semantic MediaWiki (Version 1.7.0.2) (r109011), Semantic Result Formats (Version 1.7) (r107772)

Version: unspecified
Severity: major