Help:Datatype "External identifier"

External identifier
Holds a value that associates it with with a external URI for formatting
Further information
Provided by:	Semantic MediaWiki
Since version:	2.5.0
Until version:	still in use
Datatype ID:	_eid
In this wiki:	External identifier
Table of Contents

External identifier 1 is a datatype that associates a text value to an external URL. It was introduced with Semantic MediaWiki 2.5.0Released on 14 March 2017 and compatible with MW 1.23.0 - 1.29.x..

Usage

For example, a value annotation like [[NDL ID::00564222]] is going to be represented as:

• https://id.ndl.go.jp/auth/ndlna/00564222 in case the required
• [[External formatter uri::https://id.ndl.go.jp/auth/ndlna/$1]] is denoted on the relevant property page that specifies the NDL ID property.

Features and limitations

• This datatype is a text type that requires special property "External formatter URI"Declares an external URL with placeholders $1, $2 to be denoted on the property page that uses this this type
• The annotated URI in the External formatter URI property is expected to define a place holder $1 to mark the position of the value
• This datatype can easily be combined with special property "Has uniqueness constraint"Allows to restrict value annotation to be unique or special property "Allows pattern"Pattern to match a permissible value to build restricted constraints as to what value inputs are expected or allowed
• This datatype also supports the #nowiki display formatter starting with Semantic MediaWiki 3.0.0Released on 11 October 2018 and compatible with MW 1.27.0 - 1.31.x..2
• This datatype will always result in an skos:exactMatch in the RDF output. If you want to use closeMatch, relatedMatch, broadMatch or narrowMatch, use datatype Annotation URI

Examples

• https://sandbox.semantic-mediawiki.org/wiki/Property:NDL_ID
• https://sandbox.semantic-mediawiki.org/wiki/Property:EC_number
• https://sandbox.semantic-mediawiki.org/wiki/Triacylglycerol_lipase
• https://sandbox.semantic-mediawiki.org/wiki/Attribut:Has_GND
• Property:Has_Wikidata_item_ID

Query Example

{{#ask: [[Category:City]][[Has_Wikidata_item_ID::+]]
|format=table
|?Has_Wikidata_item_ID=wikidata
|limit=5
}}

	wikidata
Amsterdam	Q727
Berlin	Q64
New York City	Q60

API example

• API result "External identifier"