This code system http://hl7.org/fhir/cited-artifact-classification-type defines the following codes:

CodeDisplayDefinition
publication-type Publication typePublication type
mesh-heading MeSH headingMeSH heading
supplemental-mesh-protocol Supplemental MeSH for ProtocolSupplemental MeSH for Protocol
supplemental-mesh-disease Supplemental MeSH for DiseaseSupplemental MeSH for Disease
supplemental-mesh-organism Supplemental MeSH for OrganismSupplemental MeSH for Organism
keyword KeywordKeyword
citation-subset Citation subsetCitation subset
chemical ChemicalChemical
publishing-model Publishing ModelUsed for PubModel attribute in Medline
knowledge-artifact-type Knowledge Artifact TypeKnowledge Artifact Type
coverage CoverageThe spatial or temporal topic of the resource, spatial applicability of the resource, or jurisdiction under which the resource is relevant
<status value="active"/><experimental value="false"/><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="Cited Artifact Classification Type"/><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/cited-artifact-classification-type"/><content value="complete"/><concept><code value="publication-type"/><display value="Publication type"/><definition value="Publication type"/></concept><concept><code value="mesh-heading"/><display value="MeSH heading"/><definition value="MeSH heading"/></concept><concept><code value="supplemental-mesh-protocol"/><display value="Supplemental MeSH for Protocol"/><definition value="Supplemental MeSH for Protocol"/></concept><concept><code value="supplemental-mesh-disease"/><display value="Supplemental MeSH for Disease"/><definition value="Supplemental MeSH for Disease"/></concept><concept><code value="supplemental-mesh-organism"/><display value="Supplemental MeSH for Organism"/><definition value="Supplemental MeSH for Organism"/></concept><concept><code value="keyword"/><display value="Keyword"/><definition value="Keyword"/></concept><concept><code value="citation-subset"/><display value="Citation subset"/><definition value="Citation subset"/></concept><concept><code value="chemical"/><display value="Chemical"/><definition value="Chemical"/></concept><concept><code value="publishing-model"/><display value="Publishing Model"/><definition value="Used for PubModel attribute in Medline"/></concept><concept><code value="knowledge-artifact-type"/><display value="Knowledge Artifact Type"/><definition value="Knowledge Artifact Type"/></concept><concept><code value="coverage"/><display value="Coverage"/><definition value="The spatial or temporal topic of the resource, spatial applicability of the resource, or jurisdiction under which the resource is relevant"/></concept></CodeSystem>