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ExternalIdentifier
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ExternalIdentifier

[Experimental]

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ExternalIdentifier["type",id]

represents a resource identified by id in the external identifier system "type".

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ExternalIdentifier["type",id,meta]

includes the metadata given by the association meta to this instance of the external identifier object.

Details

  • id is usually a string. Other expressions like integers are supported for certain external identifier types.
  • If meta contains a key "Label", then the corresponding value is used for display.
  • ExternalIdentifier[...]["prop"] can be used to access data about identifiers. Properties include:
  • "Type"the external identifier type
    "ExternalID"the raw identifier
    "Label"the label of the resource stored in meta
    "Description"the description of the resource stored in meta
    "URL"a URL to a description of the resource
    "Hyperlink"a Hyperlink to a description of the resource
    "ConceptURI"a URL identifying the resource
  • The value of the "ConceptURI" identifies a resource in the semantic web. When dereferenced, it usually redirects to a machine- or human-readable description of the resource.
  • The value of "URL" typically defaults to the value of "ConceptURI".
  • Values of "Hyperlink" are obtained by applying Hyperlink to non-missing values of "URL".

Examples

Basic Examples  (2)Summary of the most common use cases

Enter a DOI representing a scientific article:

In[1]:=1
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https://wolfram.com/xid/0btnrl7iuil0-zjv9af
Out[1]=1

Specify a "Label":

In[2]:=2
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https://wolfram.com/xid/0btnrl7iuil0-w75hdv
Out[2]=2

Extract a raw identifier:

In[1]:=1
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https://wolfram.com/xid/0btnrl7iuil0-nzo28i
Out[1]=1

Get a hyperlink:

In[2]:=2
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https://wolfram.com/xid/0btnrl7iuil0-1a6pcq
Out[2]=2
Wolfram Research (2020), ExternalIdentifier, Wolfram Language function, https://reference.wolfram.com/language/ref/ExternalIdentifier.html.
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Wolfram Research (2020), ExternalIdentifier, Wolfram Language function, https://reference.wolfram.com/language/ref/ExternalIdentifier.html.

Text

Wolfram Research (2020), ExternalIdentifier, Wolfram Language function, https://reference.wolfram.com/language/ref/ExternalIdentifier.html.

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Wolfram Research (2020), ExternalIdentifier, Wolfram Language function, https://reference.wolfram.com/language/ref/ExternalIdentifier.html.

CMS

Wolfram Language. 2020. "ExternalIdentifier." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/ExternalIdentifier.html.

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Wolfram Language. 2020. "ExternalIdentifier." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/ExternalIdentifier.html.

APA

Wolfram Language. (2020). ExternalIdentifier. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/ExternalIdentifier.html

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Wolfram Language. (2020). ExternalIdentifier. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/ExternalIdentifier.html

BibTeX

@misc{reference.wolfram_2025_externalidentifier, author="Wolfram Research", title="{ExternalIdentifier}", year="2020", howpublished="\url{https://reference.wolfram.com/language/ref/ExternalIdentifier.html}", note=[Accessed: 23-March-2025 ]}

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@misc{reference.wolfram_2025_externalidentifier, author="Wolfram Research", title="{ExternalIdentifier}", year="2020", howpublished="\url{https://reference.wolfram.com/language/ref/ExternalIdentifier.html}", note=[Accessed: 23-March-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_externalidentifier, organization={Wolfram Research}, title={ExternalIdentifier}, year={2020}, url={https://reference.wolfram.com/language/ref/ExternalIdentifier.html}, note=[Accessed: 23-March-2025 ]}

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@online{reference.wolfram_2025_externalidentifier, organization={Wolfram Research}, title={ExternalIdentifier}, year={2020}, url={https://reference.wolfram.com/language/ref/ExternalIdentifier.html}, note=[Accessed: 23-March-2025 ]}