#ask: syntax – "lang" printout language filter

#ask: syntax details:
Syntax	+lang=
Description	Allows to filter a language specific printout1
Datatype support	Datatype "Monolingual text "Holds a text value that associates the annotation with a specific language code
Component	printout
Software	Semantic MediaWiki
Since version	Semantic MediaWiki 2.5.0 Released on 14 March 2017 and compatible with MW 1.23.0 - 1.29.x.
Keyword	language filter

The +lang= printout language filter was introduced in Semantic MediaWiki 2.5.0Released on 14 March 2017 and compatible with MW 1.23.0 - 1.29.x..

Rationale

It allows to filter results that match a specific language for printout statements using the +lang= query parameter. The filtering is only applied to properties of datatype "Monolingual text"Holds a text value that associates the annotation with a specific language code.

It is applied during query post-processing after the condition has already retrieved matchable entities. The printout and hereby the data values may match text in different languages and unless the query condition was designed in a way that would made them reducible, it would display them all. Thus a query condition can be indifferent towards possible language matches, yet enables to only select the one that match the denoted language value. See the help page on datatype "Monolingual text"Holds a text value that associates the annotation with a specific language code for examples to limit the query condition to only select results for specific language.

Examples

Syntax

{{#ask:
 [[Has property description::+]]
 |?Has property description|+lang=en
}}

Result

	Property description"Property description" is a predefined property that allows to describe a property in context of a language and is provided by Semantic MediaWiki.
About city	It is used on template "TableImportAnnotations" to demonstrate the the import-annotation parameter to result format "Plainlist"Outputs results in a comma separated list, with additional outputs shown in parentheses. The output does not provide class attributes to HTML elements (default for queries without printout statements)..
Has abstract	A summary or condensed version of a piece of writing.
Has mlt	Generic property for monolingual text
Has topic label	Describes a topic label in an annotated language.
Has topic predecessor	Describes a predecessor entity for a selected topic or manual item.
Inhabitants	statistics about the human population, i.e. people that live together in the same place
NDL ID	Web National Diet Library of Japan (NDL) Authorities
Population	The number of inhabitants of some geographical place.
Wikidata ID	Wikidata ID
owl:differentFrom	The property that determines that two given individuals are different.

or only show German translations if available:

Syntax

{{#ask:
 [[Has property description::+]]
 |?Has property description|+lang=de
}}

Result

	Property description"Property description" is a predefined property that allows to describe a property in context of a language and is provided by Semantic MediaWiki.
About city
Has abstract	Eine Zusammenfassung oder Kurzfassung eines Textes.
Has mlt	Generisches Attribut für sprachspezifischen Text
Has topic label
Has topic predecessor
Inhabitants	Statistiken zur Bevölkerung, d. h. den Menschen, die am gleichen Ort zusammenleben
NDL ID
Population	Die Anzahl der Einwohner eines geografischen Orts.
Wikidata ID	Wikidata-Kennung
owl:differentFrom

Link

<sandbox.semantic-mediawiki.org>: More examples for this query parameter

See also

• Help page on datatype "Monolingual text"Holds a text value that associates the annotation with a specific language code
• Help page on special property "Language code"Handles BCP47 conform language codes specifying the language of the annotated text
• Help page on special property "Has property description"Adds localizable context help to properties