    org.hl7.fhir.exceptions.DefinitionException: StructureDefinition is not for an profile - can't be compared (left: Identifier)
    	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.check(StructureDefinitionComparer.java:195)
    	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.compare(StructureDefinitionComparer.java:129)
    	at org.hl7.fhir.r5.comparison.ComparisonSession.compare(ComparisonSession.java:107)
    	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.intersectTypes(StructureDefinitionComparer.java:1038)
    	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.compareElements(StructureDefinitionComparer.java:279)
    	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.compareChildren(StructureDefinitionComparer.java:382)
    	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.compareElements(StructureDefinitionComparer.java:295)
    	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.compare(StructureDefinitionComparer.java:173)
    	at org.hl7.fhir.r5.comparison.ComparisonSession.compare(ComparisonSession.java:107)
    	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.checkAddTypeUnion(StructureDefinitionComparer.java:966)
    	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.unionTypes(StructureDefinitionComparer.java:903)
    	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.compareElements(StructureDefinitionComparer.java:278)
    	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.compareChildren(StructureDefinitionComparer.java:382)
    	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.compareElements(StructureDefinitionComparer.java:295)
    	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.compare(StructureDefinitionComparer.java:173)
    	at org.hl7.fhir.r5.comparison.ComparisonSession.compare(ComparisonSession.java:107)
    	at org.hl7.fhir.igtools.publisher.comparators.PreviousVersionComparator.finishChecks(PreviousVersionComparator.java:267)
    	at org.hl7.fhir.igtools.publisher.PublisherProcessor.checkConformanceResources(PublisherProcessor.java:1493)
    	at org.hl7.fhir.igtools.publisher.PublisherProcessor.loadConformance2(PublisherProcessor.java:104)
    	at org.hl7.fhir.igtools.publisher.Publisher.createIg(Publisher.java:403)
    	at org.hl7.fhir.igtools.publisher.Publisher.execute(Publisher.java:232)
    	at org.hl7.fhir.igtools.publisher.Publisher.main(Publisher.java:1579)
    	at org.hl7.fhir.igtools.web.PublicationProcess.runBuild(PublicationProcess.java:1103)
    	at org.hl7.fhir.igtools.web.PublicationProcess.doPublish(PublicationProcess.java:559)
    	at org.hl7.fhir.igtools.web.PublicationProcess.publishInner2(PublicationProcess.java:467)
    	at org.hl7.fhir.igtools.web.PublicationProcess.publishInner(PublicationProcess.java:283)
    	at org.hl7.fhir.igtools.web.PublicationProcess.publish(PublicationProcess.java:143)
    	at org.hl7.fhir.igtools.publisher.Publisher.main(Publisher.java:1320)