This code system http://hl7.org/fhir/citation-artifact-classifier defines the following codes:

Code Display Definition
audio Audio file The article cited is an audio file.
D001877 Book Non-periodical written or printed works consisting of sheets of pages fastened or bound together within covers.
cds-artifact Clinical Decision Support Artifact The artifact is used for decision support for healthcare decisions.
D016420 Comment Comment
common-share Common Share Citation Resource containing value added data that is openly shared
D019991 Database A structured file of information or a set of logically related data stored and retrieved using computer-based means.
D064886 Dataset Works consisting of organized collections of data, which have been stored permanently in a formalized manner suitable for communication, interpretation, or processing.
dataset-unpublished Dataset Unpublished An organized collection of data that is not stored permanently for communication.
Electronic Electronic the journal is published in electronic format only
Electronic-eCollection Electronic-eCollection used for electronic-only journals that publish individual articles first and then later collect them into an "issue" date that is typically called an eCollection.
Electronic-Print Electronic-Print the journal is published first in electronic format followed by print (this value is currently used for just one journal, Nucleic Acids Research)
executable-app Executable app Executable app
fhir-resource FHIR Resource The article cited is a FHIR resource.
image Image file The article cited is an image file.
interactive-form Interactive Form A user interface that supports data entry and data display.
D016428 Journal Article Journal Article
D016422 Letter Letter
machine-code Machine code The article cited is machine code.
medline-base Medline Base Citation Resource containing only data from Medline
prediction-model Prediction Model A formula or expression used to calculate an outcome representing a predicted result.
D000076942 Preprint Scientific manuscript made available prior to PEER REVIEW.
Print Print the journal is published in print format only
Print-Electronic Print Electronic the journal is published in both print and electronic format
project-specific Project Specific Citation Resource containing value added data specific to a project
protocol Protocol The article cited is the protocol of an activity and not the results or findings.
pseudocode PseudoCode A non-executable, human-readable representation of software code.
D016425 Published Erratum Published Erratum
standard-specification Standard Specification An explicit set of requirements for an item, material, component, system or service, often used to define a technical standard which is an established norm or requirement for a repeatable technical task.
terminology Terminology A structured set of codes and display values, which may be subtyped as a code system, value set, taxonomy, or ontology.
D059040 Video-Audio Media Used with articles which include video files or clips, or for articles which are entirely video.
webpage Webpage Webpage
<status value="draft"/> <experimental value="true"/> <date value="2021-03-11T10:55:11.085+11:00"/> <publisher value="HL7 (FHIR Project)"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> <telecom> <system value="email"/> <value value="fhir@lists.hl7.org"/> </telecom> </contact> <description value="Citation artifact classifier"/> <jurisdiction> <coding> <system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/> <code value="001"/> <display value="World"/> </coding> </jurisdiction> <caseSensitive value="true"/> <valueSet value="http://hl7.org/fhir/ValueSet/citation-artifact-classifier"/> <content value="complete"/> <concept> <code value="audio"/> <display value="Audio file"/> <definition value="The article cited is an audio file."/> </concept> <concept> <code value="D001877"/> <display value="Book"/> <definition value="Non-periodical written or printed works consisting of sheets of pages fastened or bound together within covers."/> </concept> <concept> <code value="cds-artifact"/> <display value="Clinical Decision Support Artifact"/> <definition value="The artifact is used for decision support for healthcare decisions."/> </concept> <concept> <code value="D016420"/> <display value="Comment"/> <definition value="Comment"/> </concept> <concept> <code value="common-share"/> <display value="Common Share"/> <definition value="Citation Resource containing value added data that is openly shared"/> </concept> <concept> <code value="D019991"/> <display value="Database"/> <definition value="A structured file of information or a set of logically related data stored and retrieved using computer-based means."/> </concept> <concept> <code value="D064886"/> <display value="Dataset"/> <definition value="Works consisting of organized collections of data, which have been stored permanently in a formalized manner suitable for communication, interpretation, or processing."/> </concept> <concept> <code value="dataset-unpublished"/> <display value="Dataset Unpublished"/> <definition value="An organized collection of data that is not stored permanently for communication."/> </concept> <concept> <code value="Electronic"/> <display value="Electronic"/> <definition value="the journal is published in electronic format only"/> </concept> <concept> <code value="Electronic-eCollection"/> <display value="Electronic-eCollection"/> <definition value="used for electronic-only journals that publish individual articles first and then later collect them into an "issue" date that is typically called an eCollection."/> </concept> <concept> <code value="Electronic-Print"/> <display value="Electronic-Print"/> <definition value="the journal is published first in electronic format followed by print (this value is currently used for just one journal, Nucleic Acids Research)"/> </concept> <concept> <code value="executable-app"/> <display value="Executable app"/> <definition value="Executable app"/> </concept> <concept> <code value="fhir-resource"/> <display value="FHIR Resource"/> <definition value="The article cited is a FHIR resource."/> </concept> <concept> <code value="image"/> <display value="Image file"/> <definition value="The article cited is an image file."/> </concept> <concept> <code value="interactive-form"/> <display value="Interactive Form"/> <definition value="A user interface that supports data entry and data display."/> </concept> <concept> <code value="D016428"/> <display value="Journal Article"/> <definition value="Journal Article"/> </concept> <concept> <code value="D016422"/> <display value="Letter"/> <definition value="Letter"/> </concept> <concept> <code value="machine-code"/> <display value="Machine code"/> <definition value="The article cited is machine code."/> </concept> <concept> <code value="medline-base"/> <display value="Medline Base"/> <definition value="Citation Resource containing only data from Medline"/> </concept> <concept> <code value="prediction-model"/> <display value="Prediction Model"/> <definition value="A formula or expression used to calculate an outcome representing a predicted result."/> </concept> <concept> <code value="D000076942"/> <display value="Preprint"/> <definition value="Scientific manuscript made available prior to PEER REVIEW."/> </concept> <concept> <code value="Print"/> <display value="Print"/> <definition value="the journal is published in print format only"/> </concept> <concept> <code value="Print-Electronic"/> <display value="Print Electronic"/> <definition value="the journal is published in both print and electronic format"/> </concept> <concept> <code value="project-specific"/> <display value="Project Specific"/> <definition value="Citation Resource containing value added data specific to a project"/> </concept> <concept> <code value="protocol"/> <display value="Protocol"/> <definition value="The article cited is the protocol of an activity and not the results or findings."/> </concept> <concept> <code value="pseudocode"/> <display value="PseudoCode"/> <definition value="A non-executable, human-readable representation of software code."/> </concept> <concept> <code value="D016425"/> <display value="Published Erratum"/> <definition value="Published Erratum"/> </concept> <concept> <code value="standard-specification"/> <display value="Standard Specification"/> <definition value="An explicit set of requirements for an item, material, component, system or service, often used to define a technical standard which is an established norm or requirement for a repeatable technical task."/> </concept> <concept> <code value="terminology"/> <display value="Terminology"/> <definition value="A structured set of codes and display values, which may be subtyped as a code system, value set, taxonomy, or ontology."/> </concept> <concept> <code value="D059040"/> <display value="Video-Audio Media"/> <definition value="Used with articles which include video files or clips, or for articles which are entirely video."/> </concept> <concept> <code value="webpage"/> <display value="Webpage"/> <definition value="Webpage"/> </concept> </CodeSystem>