Credential Transparency Description Language Release History

This page displays the release history for the Credential Transparency Description Language schema. Each release contains a set of changes, which are documented below. Each change describes what was changed, why, and links to one or more relevant Github issues.

April 2026 CTDL Release (20260424) (Current Release)

This is the April 2026 CTDL release.

View Terms | Jump to Mapping Changes

ceterms:hasIndustry View Term History: JSON Turtle

Change:

schema:domainIncludes: Added ceterms:Job
rdfs:comment: Added
en-US Industry related to this resource.
schema:domainIncludes: Added ceterms:Occupation
schema:domainIncludes: Added ceterms:Organization
vs:term_status: Added vs:unstable
rdfs:label: Added
en-US Has Industry
schema:rangeIncludes: Added ceterms:Industry

Reason:

en-US Indicate relevant industry for Occupation and Organization.

https://github.com/CredentialEngine/Schema-Development/issues/982

ceterms:hasSpecialization View Term History: JSON Turtle

Change:

schema:rangeIncludes: Added ceterms:Industry
schema:domainIncludes: Added ceterms:Industry
rdfs:comment: Added More specialized profession, trade, career field, or industry that is encompassed by the one being described.
rdfs:comment: Removed More specialized profession, trade, or career field that is encompassed by the one being described.

Reason:

en-US Allow for specializations of industries.

https://github.com/CredentialEngine/Schema-Development/issues/982

ceterms:instrument View Term History: JSON Turtle

Change:

dct:description: Added
en-US May be a credential or rubric whose criteria were applied in executing the action or process; may be a data set profile that provided measurements of relevant metrics.
schema:rangeIncludes: Added qdata:DataSetProfile
rdfs:comment: Added
en-US Resource used to carry out an action or process.
rdfs:comment: Removed
en-US Object that helped the agent perform the action. e.g. John wrote a book with a pen.
dct:description: Removed
en-US A credential or other instrument whose criteria was applied in executing the action or process.

Reason:

en-US Allow Data Sets to be referenced as used in processes & actions.

https://github.com/CredentialEngine/Schema-Development/issues/1045

ceterms:isSimilarTo View Term History: JSON Turtle

Change:

schema:domainIncludes: Added ceterms:AssessmentProfile
schema:domainIncludes: Added ceterms:AcademicCertificate
schema:rangeIncludes: Added ceterms:SupportService
schema:rangeIncludes: Added ceterms:AcademicCertificate
schema:rangeIncludes: Added ceterms:AssessmentProfile
schema:domainIncludes: Added ceterms:Task
schema:rangeIncludes: Added ceterms:Job
schema:rangeIncludes: Added ceterms:PostBaccalaureateCertificate
schema:domainIncludes: Added ceterms:TechnicalLevel2Certificate
schema:rangeIncludes: Added qdata:Metric
schema:domainIncludes: Added ceterms:TechnicalLevel1Certificate
schema:domainIncludes: Added ceterms:QualificationsFramework
schema:rangeIncludes: Added ceasn:RubricCriterion
schema:domainIncludes: Added ceterms:TransferAgreement
schema:rangeIncludes: Added ceterms:CertificateOfParticipation
schema:domainIncludes: Added ceterms:WorkBasedLearningCertificate
schema:domainIncludes: Added ceterms:PriorLearningPolicy
schema:rangeIncludes: Added ceterms:TransferAgreement
schema:rangeIncludes: Added ceterms:Occupation
schema:rangeIncludes: Added ceterms:WorkBasedLearningCertificate
schema:domainIncludes: Added ceasn:CompetencyFramework
schema:domainIncludes: Added ceterms:BasicTechnicalCertificate
schema:rangeIncludes: Added ceterms:ScheduledOffering
schema:domainIncludes: Added ceterms:SecondaryEducationCertificate
schema:domainIncludes: Added ceterms:PostBaccalaureateCertificate
schema:rangeIncludes: Added ceterms:ProcessProfile
schema:domainIncludes: Added ceterms:PreApprenticeshipCertificate
schema:rangeIncludes: Added ceterms:PreApprenticeshipCertificate
schema:domainIncludes: Added ceterms:GeneralEducationLevel2Certificate
schema:domainIncludes: Added ceterms:ProcessProfile
schema:domainIncludes: Added ceterms:GeneralEducationLevel1Certificate
schema:domainIncludes: Added ceterms:PostMasterCertificate
schema:domainIncludes: Added ceterms:CertificateOfParticipation
schema:rangeIncludes: Added ceterms:GeneralEducationLevel1Certificate
schema:rangeIncludes: Added ceterms:SecondaryEducationCertificate
schema:domainIncludes: Added ceterms:ProficiencyCertificate
schema:domainIncludes: Added ceterms:Industry
schema:domainIncludes: Added ceterms:CredentialType
schema:rangeIncludes: Added expand:CredentialingAction
schema:rangeIncludes: Added ceterms:LearningOpportunityProfile
schema:rangeIncludes: Added ceterms:QualificationsFramework
schema:rangeIncludes: Added ceterms:ProfessionalCertificate
schema:domainIncludes: Added ceterms:SupportService
schema:domainIncludes: Added qdata:Metric
schema:rangeIncludes: Added ceterms:TechnicalLevel1Certificate
schema:domainIncludes: Added ceterms:CredentialType
schema:rangeIncludes: Added ceasn:CompetencyFramework
schema:rangeIncludes: Added ceterms:PostMasterCertificate
schema:domainIncludes: Added expand:Credential
schema:domainIncludes: Added expand:CredentialingAction
schema:rangeIncludes: Added ceasn:Rubric
schema:domainIncludes: Added skos:ConceptScheme
schema:rangeIncludes: Added ceterms:WorkRole
schema:domainIncludes: Added ceasn:RubricCriterion
schema:rangeIncludes: Added expand:Credential
schema:rangeIncludes: Added ceterms:ProficiencyCertificate
schema:domainIncludes: Added ceterms:Course
schema:rangeIncludes: Added ceterms:Task
schema:rangeIncludes: Added ceterms:TechnicalLevel3Certificate
schema:domainIncludes: Added ceterms:HigherEducationLevel1Certificate
schema:rangeIncludes: Added ceterms:CredentialType
schema:rangeIncludes: Added ceterms:LearningProgram
schema:rangeIncludes: Added ceterms:HigherEducationLevel2Certificate
schema:rangeIncludes: Added ceterms:HigherEducationLevel1Certificate
schema:rangeIncludes: Added ceterms:PriorLearningPolicy
schema:domainIncludes: Added ceterms:VerificationServiceProfile
schema:rangeIncludes: Added ceterms:GeneralEducationLevel2Certificate
schema:domainIncludes: Added ceterms:LearningOpportunityProfile
schema:domainIncludes: Added ceterms:Occupation
schema:domainIncludes: Added ceterms:WorkRole
schema:rangeIncludes: Added ceterms:BasicTechnicalCertificate
schema:rangeIncludes: Added ceterms:Industry
schema:rangeIncludes: Added ceterms:CredentialType
schema:rangeIncludes: Added ceterms:VerificationServiceProfile
schema:domainIncludes: Added ceterms:ScheduledOffering
schema:domainIncludes: Added ceterms:TechnicalLevel3Certificate
schema:rangeIncludes: Added ceterms:TechnicalLevel2Certificate
schema:domainIncludes: Added ceterms:HigherEducationLevel2Certificate
schema:domainIncludes: Added ceterms:LearningProgram
schema:rangeIncludes: Added ceterms:Course
schema:domainIncludes: Added ceasn:Rubric
schema:domainIncludes: Added ceterms:ProfessionalCertificate
schema:domainIncludes: Added ceterms:Job
schema:rangeIncludes: Added skos:ConceptScheme

Reason:

en-US Show where ceterms:isSimilarTo is most appropriate by explicitly listing classes in its range includes.

https://github.com/CredentialEngine/Schema-Development/issues/1051

ceterms:isSpecializationOf View Term History: JSON Turtle

Change:

schema:domainIncludes: Added ceterms:Industry
schema:rangeIncludes: Added ceterms:Industry
rdfs:comment: Added
en-US More specialized profession, trade, career field, or industry that is encompassed by the one being described.
rdfs:comment: Removed
en-US More specialized profession, trade, or career field that is encompassed by the one being described.

Reason:

en-US Allow for specializations of industries.

https://github.com/CredentialEngine/Schema-Development/issues/982

ceterms:jurisdiction View Term History: JSON Turtle

Change:

schema:domainIncludes: Added ceterms:Collection

Reason:

en-US Specify geo-political validity of a Collection.

https://github.com/CredentialEngine/Schema-Development/issues/1045

ceterms:legalName View Term History: JSON Turtle

Change:

schema:domainIncludes: Added ceterms:CredentialOrganization
vs:term_status: Added vs:unstable
schema:rangeIncludes: Added rdf:langString
rdfs:comment: Added
en-US Name of the organization as formally registered with a governmental or other legal authority.
schema:domainIncludes: Added ceterms:Organization
rdfs:subPropertyOf: Added ceterms:name
schema:domainIncludes: Added ceterms:QACredentialOrganization
vann:usageNote: Added
en-US If the legal name is different from the data provided for ceterms:name then the legal name must be provided using this property.
owl:equivalentProperty: Added schema:legalName
dct:description: Added
en-US An officially registered company name would be a legal name and may differ from the commonly used name that may be entered for ceterms:name.
rdfs:label: Added
en-US Legal Name

Reason:

en-US Show when the legal name of an Organization is different to its commonly used name.

https://github.com/CredentialEngine/Schema-Development/issues/1058

ceterms:preparationFrom View Term History: JSON Turtle

Change:

schema:domainIncludes: Added ceterms:Job

Reason:

en-US Fix that we can say that a Credential etc is preparation/recommended for a Job from the Credential but not from the Job.

https://github.com/CredentialEngine/Schema-Development/issues/982

ceterms:recognizedForIndustry View Term History: JSON Turtle

Change:

schema:domainIncludes: Added ceasn:Competency
schema:domainIncludes: Added ceterms:AssessmentProfile
schema:domainIncludes: Added ceterms:ProfessionalCertificate
schema:domainIncludes: Added ceterms:Badge
schema:domainIncludes: Added ceterms:ProfessionalDoctorate
schema:domainIncludes: Added ceterms:BasicTechnicalCertificate
schema:domainIncludes: Added ceterms:AssociateOfScienceDegree
schema:domainIncludes: Added ceterms:BachelorOfArtsDegree
schema:domainIncludes: Added ceterms:GeneralEducationLevel1Certificate
schema:domainIncludes: Added ceterms:ResearchDoctorate
vs:term_status: Added vs:unstable
schema:domainIncludes: Added ceterms:AcademicCertificate
schema:domainIncludes: Added ceterms:Collection
schema:domainIncludes: Added ceterms:TechnicalLevel3Certificate
schema:domainIncludes: Added ceterms:WorkBasedLearningCertificate
rdfs:label: Added
en-US Recognized For Industry
schema:domainIncludes: Added ceterms:MasterOfArtsDegree
schema:domainIncludes: Added ceterms:MasterOfScienceDegree
schema:domainIncludes: Added ceterms:SecondaryEducationCertificate
schema:domainIncludes: Added ceterms:SecondarySchoolDiploma
schema:domainIncludes: Added ceterms:Course
schema:domainIncludes: Added ceterms:Certificate
schema:domainIncludes: Added ceterms:HigherEducationLevel1Certificate
schema:domainIncludes: Added ceterms:PostBaccalaureateCertificate
schema:domainIncludes: Added ceterms:CertificateOfCompletion
schema:domainIncludes: Added ceterms:HigherEducationLevel2Certificate
schema:domainIncludes: Added ceterms:MasterDegree
schema:domainIncludes: Added ceterms:ProficiencyCertificate
schema:domainIncludes: Added ceterms:TechnicalLevel2Certificate
schema:domainIncludes: Added ceterms:Degree
schema:domainIncludes: Added ceterms:MasterCertificate
schema:domainIncludes: Added ceterms:PostMasterCertificate
schema:domainIncludes: Added ceterms:AssociateOfAppliedScienceDegree
schema:domainIncludes: Added ceterms:BachelorDegree
schema:domainIncludes: Added ceterms:AssociateDegree
schema:domainIncludes: Added ceterms:AssociateOfAppliedArtsDegree
schema:domainIncludes: Added ceterms:LearningOpportunityProfile
schema:domainIncludes: Added ceterms:SpecialistDegree
schema:domainIncludes: Added ceterms:AssociateOfArtsDegree
schema:domainIncludes: Added ceterms:TechnicalLevel1Certificate
schema:domainIncludes: Added ceterms:PreApprenticeshipCertificate
schema:domainIncludes: Added ceterms:Credential
schema:domainIncludes: Added ceterms:MicroCredential
schema:domainIncludes: Added ceterms:License
schema:domainIncludes: Added ceterms:OpenBadge
schema:domainIncludes: Added ceterms:BachelorOfScienceDegree
schema:domainIncludes: Added ceterms:Certification
schema:domainIncludes: Added ceterms:Diploma
schema:domainIncludes: Added ceterms:GeneralEducationDevelopment
schema:domainIncludes: Added ceasn:CompetencyFramewor
schema:domainIncludes: Added ceterms:DoctoralDegree
schema:rangeIncludes: Added ceterms:Industry
schema:domainIncludes: Added ceterms:CredentialType
schema:domainIncludes: Added ceterms:QualityAssuranceCredential
schema:domainIncludes: Added ceterms:GeneralEducationLevel2Certificate
schema:domainIncludes: Added ceterms:LearningProgram
rdfs:comment: Added
en-US Industry for which this resource is acknowledged to be valid.
schema:domainIncludes: Added ceterms:DigitalBadge
schema:domainIncludes: Added ceterms:CertificateOfParticipation
schema:domainIncludes: Added ceterms:ApprenticeshipCertificate
schema:domainIncludes: Added ceterms:JourneymanCertificate

Reason:

en-US Indicate industry recognition for Credentials, Learning Ops etc.

https://github.com/CredentialEngine/Schema-Development/issues/982

ceterms:recommends View Term History: JSON Turtle

Change:

schema:domainIncludes: Added ceterms:Job

Reason:

en-US Fix that we can say that a Credential etc is preparation/recommended for a Job from the Credential but not from the Job.

https://github.com/CredentialEngine/Schema-Development/issues/982

ceterms:resultsInCredential View Term History: JSON Turtle

Change:

schema:rangeIncludes: Added ceterms:PostBaccalaureateCertificate
vann:usageNote: Added
en-US Use when completion of the resource being described is the only requirement for the award of the Credential; otherwise use one of ceterms:isPreparationFor, ceterms:isRecommendedFor, ceterms:isRequiredFor.
schema:rangeIncludes: Added expand:Credential
schema:rangeIncludes: Added ceterms:AssociateOfAppliedArtsDegree
schema:rangeIncludes: Added ceterms:Credential
schema:rangeIncludes: Added ceterms:ProfessionalDoctorate
schema:rangeIncludes: Added ceterms:BachelorOfScienceDegree
schema:rangeIncludes: Added ceterms:Certification
schema:rangeIncludes: Added ceterms:ResearchDoctorate
rdfs:comment: Added
en-US Credential awarded as the result of successful completion of the resource being described.
schema:rangeIncludes: Added ceterms:MasterOfArtsDegree
schema:rangeIncludes: Added ceterms:PreApprenticeshipCertificate
schema:rangeIncludes: Added ceterms:GeneralEducationDevelopment
schema:domainIncludes: Added ceterms:LearningOpportunityProfile
schema:rangeIncludes: Added ceterms:MasterCertificate
schema:rangeIncludes: Added ceterms:ApprenticeshipCertificate
schema:rangeIncludes: Added ceterms:BachelorDegree
schema:rangeIncludes: Added ceterms:MasterOfScienceDegree
schema:rangeIncludes: Added ceterms:TechnicalLevel1Certificate
schema:rangeIncludes: Added ceterms:Certificate
schema:rangeIncludes: Added ceterms:AssociateOfAppliedScienceDegree
schema:rangeIncludes: Added ceterms:AssociateOfScienceDegree
schema:rangeIncludes: Added ceterms:MicroCredential
schema:rangeIncludes: Added ceterms:PostMasterCertificate
schema:rangeIncludes: Added ceterms:MasterDegree
schema:domainIncludes: Added ceterms:LearningProgram
schema:domainIncludes: Added ceterms:AssessmentProfile
schema:rangeIncludes: Added ceterms:BachelorOfArtsDegree
schema:rangeIncludes: Added ceterms:QualityAssuranceCredential
schema:rangeIncludes: Added ceterms:SecondaryEducationCertificate
schema:rangeIncludes: Added ceterms:OpenBadge
schema:rangeIncludes: Added ceterms:JourneymanCertificate
rdfs:label: Added
en-US Results In Credential
schema:domainIncludes: Added ceterms:Course
schema:rangeIncludes: Added ceterms:AssociateOfArtsDegree
schema:rangeIncludes: Added ceterms:WorkBasedLearningCertificate
schema:rangeIncludes: Added ceterms:Badge
schema:rangeIncludes: Added ceterms:CredentialType
schema:rangeIncludes: Added ceterms:ProficiencyCertificate
schema:rangeIncludes: Added ceterms:AssociateDegree
vs:term_status: Added vs:unstable
schema:rangeIncludes: Added ceterms:ProfessionalCertificate
schema:rangeIncludes: Added ceterms:DoctoralDegree
schema:rangeIncludes: Added ceterms:GeneralEducationLevel2Certificate
schema:rangeIncludes: Added ceterms:AcademicCertificate
schema:rangeIncludes: Added ceterms:GeneralEducationLevel1Certificate
schema:rangeIncludes: Added ceterms:SpecialistDegree
schema:rangeIncludes: Added ceterms:Degree
schema:rangeIncludes: Added ceterms:CertificateOfParticipation
schema:rangeIncludes: Added ceterms:Diploma
schema:rangeIncludes: Added ceterms:HigherEducationLevel2Certificate
schema:rangeIncludes: Added ceterms:TechnicalLevel3Certificate
schema:rangeIncludes: Added ceterms:BasicTechnicalCertificate
schema:rangeIncludes: Added ceterms:SecondarySchoolDiploma
schema:rangeIncludes: Added ceterms:DigitalBadge
schema:rangeIncludes: Added ceterms:License
schema:rangeIncludes: Added ceterms:TechnicalLevel2Certificate
schema:rangeIncludes: Added ceterms:CertificateOfCompletion
schema:rangeIncludes: Added ceterms:HigherEducationLevel1Certificate

Reason:

en-US Indicate that a learning opportunity results in a credential.

https://github.com/CredentialEngine/Schema-Development/issues/1054

ceterms:targetMetric View Term History: JSON Turtle

Change:

rdfs:label: Added
en-US Target Metric
rdfs:comment: Added
en-US Metric used to assess whether a condition has been met.
vs:term_status: Added vs:unstable
schema:domainIncludes: Added ceterms:ConditionProfile
schema:rangeIncludes: Added qdata:Metric

Reason:

en-US Allow Metrics to be used when specifying conditions.

https://github.com/CredentialEngine/Schema-Development/issues/1045

collectionCategory:HighSkill View Term History: JSON Turtle

Change:

skos:definition: Added
en-US Occupations, Jobs, Work Roles, or Tasks meeting skill level criteria based on labor market data per the promulgating body.
skos:topConceptOf: Added ceterms:CollectionCategory
skos:prefLabel: Added
en-US High Skill
skos:inScheme: Added ceterms:CollectionCategory
vs:term_status: Added vs:unstable

Reason:

en-US Indicate that resources are in demand, high skill, or high wage by inclusion in a collection of such resources.

https://github.com/CredentialEngine/Schema-Development/issues/1045

collectionCategory:HighWage View Term History: JSON Turtle

Change:

skos:topConceptOf: Added ceterms:CollectionCategory
skos:definition: Added
en-US Occupations and Jobs meeting earnings threshold criteria based on labor market data per the promulgating body.
vs:term_status: Added vs:unstable
skos:inScheme: Added ceterms:CollectionCategory
skos:prefLabel: Added
en-US High Wage

Reason:

en-US Indicate that resources are in demand, high skill, or high wage by inclusion in a collection of such resources.

https://github.com/CredentialEngine/Schema-Development/issues/1045

collectionCategory:InDemand View Term History: JSON Turtle

Change:

skos:topConceptOf: Added ceterms:CollectionCategory
skos:prefLabel: Added
en-US In Demand
skos:definition: Added
en-US Resources meeting workforce demand criteria based on labor market data per the promulgating body.
vs:term_status: Added vs:unstable
skos:inScheme: Added ceterms:CollectionCategory