Help:Datatype "External identifier"

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External identifier
Holds a value that associates it with with a external URI for formatting
Further Information
Provided by: Semantic MediaWiki
Added in version: 2.5.0
Removed in version: still in use
Datatype ID:
Table of Contents

External identifier 1 is a datatype that associates a text value to an external URL.

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

  • in case the required
  • [[External formatter uri::$1]] is denoted on the relevant property page that specifies the NDL ID property.

Features and limitations

  • The External identifier type is a text type that requires the External formatter URI property 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 type can easily be combined with Has uniqueness constraint or Allows pattern to build restricted constraints as to what value inputs are expected or allowed


Related query syntax elements


Help pageSyntax elementDescription
#ask: annotation query marker
Marks an inline query as part of an annotation2
#ask: control query marker
Allows to dynamically alter a result display without the need to reload a page3
#ask: deferred query marker
Marks an inline query as deferred from regular parsing3
#ask: hierarchy depth restriction
Restricts the hierarchy depth of a query4
#ask: printout column width
Defines an alignment for the content of a printout column
#ask: printout column width
Defines a width for a printout column5

This documentation page applies to all SMW versions from 2.5.0 to the most current version.

Help:External identifier en 2.5.0


  1. ^
  2. ^  Semantic MediaWiki: GitHub pull request gh:smw:2572
  3. a b  Semantic MediaWiki: GitHub pull request gh:smw:2398 (Add support for @deferred mode)
  4. ^  Semantic MediaWiki: GitHub issue gh:smw:2662
  5. ^  Semantic MediaWiki: GitHub pull request gh:smw:2677