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.

February 2026 CTDL Release (20260227) (Current Release)

This is the February 2026 release.

View Terms | Jump to Mapping Changes

audLevel:AssociatesDegreeLevel View Term History: JSON Turtle

Change:

dct:description: Added
en-US Aligns to ISCED 2011 level 5 – Short-cycle tertiary education.

Reason:

en-US show alignment of our AudienceLevel to ISCED 2011.

https://github.com/CredentialEngine/Schema-Development/issues/1042

audLevel:BachelorsDegreeLevel View Term History: JSON Turtle

Change:

dct:description: Added
en-US Aligns to ISCED 2011 level 6 – Bachelor’s or equivalent level.

Reason:

en-US show alignment of our AudienceLevel to ISCED 2011.

https://github.com/CredentialEngine/Schema-Development/issues/1042

audLevel:DoctoralDegreeLevel View Term History: JSON Turtle

Change:

dct:description: Added
en-US Aligns to ISCED 2011 level 8 – Doctoral or equivalent level

Reason:

en-US show alignment of our AudienceLevel to ISCED 2011.

https://github.com/CredentialEngine/Schema-Development/issues/1042

audLevel:EarlyChildhood View Term History: JSON Turtle

Change:

dct:description: Added
en-US Aligns to ISCED 2011 level 0 – Early childhood education.

Reason:

en-US show alignment of our AudienceLevel to ISCED 2011.

https://github.com/CredentialEngine/Schema-Development/issues/1042

audLevel:LowerSecondary View Term History: JSON Turtle

Change:

dct:description: Added
en-US Aligns to ISCED 2011 level 2 – Lower secondary education.

Reason:

en-US show alignment of our AudienceLevel to ISCED 2011.

https://github.com/CredentialEngine/Schema-Development/issues/1042

audLevel:LowerSecondary View Term History: JSON Turtle

Change:

skos:broader: Added audLevel:SecondaryLevel
skos:broader: Removed audLevel:Secondary

Reason:

en-US fix incorrect link

fix incorrect link

audLevel:MastersDegreeLevel View Term History: JSON Turtle

Change:

dct:description: Added
en-US Aligns to ISCED 2011 level 7 – Master’s or equivalent level.

Reason:

en-US show alignment of our AudienceLevel to ISCED 2011.

https://github.com/CredentialEngine/Schema-Development/issues/1042

audLevel:Primary View Term History: JSON Turtle

Change:

dct:description: Added
en-US Aligns to ISCED 2011 level 1 – Primary education.

Reason:

en-US show alignment of our AudienceLevel to ISCED 2011.

https://github.com/CredentialEngine/Schema-Development/issues/1042

audLevel:UpperSecondary View Term History: JSON Turtle

Change:

skos:broader: Added audLevel:SecondaryLevel
skos:broader: Removed audLevel:Secondary

Reason:

en-US fix incorrect link

https://github.com/CredentialEngine/Schema-Development/issues/1047#top

audLevel:UpperSecondary View Term History: JSON Turtle

Change:

dct:description: Added
en-US Aligns to ISCED 2011 level 3 – Upper secondary education.

Reason:

en-US show alignment of our AudienceLevel to ISCED 2011.

https://github.com/CredentialEngine/Schema-Development/issues/1042

ceterms:basePeriod View Term History: JSON Turtle

Change:

schema:rangeIncludes: Added xsd:duration
schema:domainIncludes: Added ceterms:PayProfile
vs:term_status: Added vs:unstable
dct:description: Added
en-US The duration will be specified using ISO8601 duration format. Common examples indicate that a salary is given on a per annum basis, in which case the value would be P1Y; for an hourly rate of pay the value would be PT1H.
rdfs:comment: Added
en-US Duration to which a monetary amount applies.
rdfs:label: Added
en-US Base Period

Reason:

en-US Allow for salaries/wages to be described.

https://github.com/CredentialEngine/Schema-Development/issues/1043

ceterms:closingDate View Term History: JSON Turtle

Change:

schema:rangeIncludes: Added xsd:date
rdfs:comment: Added
en-US Date the organization ceased operations or ceased to exist.
vs:term_status: Added vs:unstable
schema:domainIncludes: Added ceterms:CredentialOrganization
schema:domainIncludes: Added ceterms:Organization
rdfs:label: Added
en-US Closing Date
schema:domainIncludes: Added ceterms:QACredentialOrganization

Reason:

en-US Express when an Organization closed.

https://github.com/CredentialEngine/Schema-Development/issues/1044

ceterms:currency View Term History: JSON Turtle

Change:

schema:domainIncludes: Added ceterms:PayProfile

Reason:

en-US Allow for salaries/wages to be described.

https://github.com/CredentialEngine/Schema-Development/issues/1043

ceterms:dateEffective View Term History: JSON Turtle

Change:

schema:domainIncludes: Added ceterms:PayProfile

Reason:

en-US Allow for salaries/wages to be described.

https://github.com/CredentialEngine/Schema-Development/issues/1043

ceterms:description View Term History: JSON Turtle

Change:

schema:domainIncludes: Added ceterms:PayProfile

Reason:

en-US Allow for salaries/wages to be described.

https://github.com/CredentialEngine/Schema-Development/issues/1043

ceterms:expirationDate View Term History: JSON Turtle

Change:

schema:domainIncludes: Added ceterms:PayProfile

Reason:

en-US Allow for salaries/wages to be described.

https://github.com/CredentialEngine/Schema-Development/issues/1043

ceterms:financialAssistanceForType View Term History: JSON Turtle

Change:

schema:domainIncludes: Added ceterms:FinancialAssitanceProfile
schema:domainIncludes: Removed ceterms:FinancialAssistance

Reason:

en-US Fixing a bug

https://github.com/CredentialEngine/Schema-Development/issues/1049

ceterms:jobLevelType View Term History: JSON Turtle

Change:

schema:domainIncludes: Added ceterms:Job
vs:term_status: Added vs:unstable
rdfs:label: Added
en-US Job Level Type
schema:rangeIncludes: Added skos:Concept
rdfs:comment: Added
en-US Type of level or grade indicating a point in a job or role progression, such as seniority or responsibility; select from an existing enumeration of such types.

Reason:

en-US Allow for salaries/wages to be described.

https://github.com/CredentialEngine/Schema-Development/issues/1043

ceterms:payBandType View Term History: JSON Turtle

Change:

vs:term_status: Added vs:unstable
rdfs:comment: Added
en-US Type of pay band indicating a range or classification of monetary compensation associated with work; select from an existing enumeration of such types.
rdfs:label: Added
en-US Pay Band Type
schema:rangeIncludes: Added skos:Concept
schema:domainIncludes: Added ceterms:PayProfile

Reason:

en-US Allow for salaries/wages to be described.

https://github.com/CredentialEngine/Schema-Development/issues/1043

ceterms:paymentPatternType View Term History: JSON Turtle

Change:

rdfs:label: Added
en-US Payment Pattern Type
schema:rangeIncludes: Added skos:Concept
rdfs:comment: Added
en-US Type of pattern for payments, indicating how often a payment is made; select from an existing enumeration of such types.
meta:targetScheme: Added ceterms:ScheduleFrequency
dct:description: Added
en-US Common examples indicate that a worker is paid weekly, monthly, on demand.
schema:domainIncludes: Added ceterms:PayProfile
vs:term_status: Added vs:unstable

Reason:

en-US Allow for salaries/wages to be described.

https://github.com/CredentialEngine/Schema-Development/issues/1043

ceterms:PayProfile View Term History: JSON Turtle

Change:

rdfs:comment: Added
en-US Entity that describes the monetary compensation for work.
rdfs:subClassOf: Added schema:MonetaryAmount
rdfs:label: Added
en-US Pay Profile
vs:term_status: Added vs:unstable

Reason:

en-US Allow for salaries/wages to be described.

https://github.com/CredentialEngine/Schema-Development/issues/1043

ceterms:requires View Term History: JSON Turtle

Change:

schema:domainIncludes: Added ceterms:PayProfile

Reason:

en-US Allow for salaries/wages to be described.

https://github.com/CredentialEngine/Schema-Development/issues/1043

ceterms:workPay View Term History: JSON Turtle

Change:

vs:term_status: Added vs:unstable
schema:rangeIncludes: Added ceterms:PayProfile
schema:domainIncludes: Added ceterms:LearningOpportunityProfile
schema:domainIncludes: Added ceterms:LearningProgram
schema:domainIncludes: Added ceterms:Job
rdfs:comment: Added
en-US Monetary compensation associated with work.
rdfs:label: Added
en-US Work Pay

Reason:

en-US Allow for salaries/wages to be described.

https://github.com/CredentialEngine/Schema-Development/issues/1043

inputType:ArtificialIntelligence View Term History: JSON Turtle

Change:

skos:prefLabel: Added
en-US Artificial Intelligence
skos:topConceptOf: Added ceterms:ExternalInput
vs:term_status: Added vs:unstable
skos:inScheme: Added ceterms:ExternalInput
skos:definition: Added
en-US External stakeholder review, guidance or recommendations based on, or provided by any form of AI.

Reason:

en-US Extend types of external input that can be specified.

https://github.com/CredentialEngine/Schema-Development/issues/1019

inputType:Committee View Term History: JSON Turtle

Change:

skos:prefLabel: Added
en-US Committee
skos:topConceptOf: Added ceterms:ExternalInput
vs:term_status: Added vs:unstable
skos:inScheme: Added ceterms:ExternalInput
skos:definition: Added
en-US External stakeholder review, guidance or recommendations by a group of individuals convened to represent a larger group or range of stakeholders.

Reason:

en-US Extend types of external input that can be specified.

https://github.com/CredentialEngine/Schema-Development/issues/1019

learnMethod:CocurricularLearning View Term History: JSON Turtle

Change:

skos:definition: Added
en-US Learning opportunity that supplements or complements the curriculum.
skos:topConceptOf: Added ceterms:LearningMethod
vs:term_status: Added vs:unstable
vann:usageNote: Added
en-US Use for activities that are not part of a formal curriculum.
skos:prefLabel: Added
en-US Cocurricular Learning
skos:inScheme: Added ceterms:LearningMethod

Reason:

en-US Allow publishing cocurricular programs as Learning Opportunities

https://github.com/CredentialEngine/Schema-Development/issues/1048

scheduleFrequency:BiWeekly View Term History: JSON Turtle

Change:

vs:term_status: Added vs:unstable
skos:topConceptOf: Added ceterms:ScheduleFrequency
skos:prefLabel: Added
en-US Bi-Weekly
skos:inScheme: Added ceterms:ScheduleFrequency
skos:definition: Added
en-US Schedule is on a bi-weekly basis, typically occurring every other week.

Reason:

en-US Allow for salaries/wages to be described.

https://github.com/CredentialEngine/Schema-Development/issues/1043

scheduleFrequency:Daily View Term History: JSON Turtle

Change:

skos:topConceptOf: Added ceterms:ScheduleFrequency
vs:term_status: Added vs:unstable
skos:prefLabel: Added
en-US Daily
skos:inScheme: Added ceterms:ScheduleFrequency
skos:definition: Added
en-US Schedule is on a daily basis, typically occurring once per day.

Reason:

en-US Allow for salaries/wages to be described.

https://github.com/CredentialEngine/Schema-Development/issues/1043

scheduleFrequency:Hourly View Term History: JSON Turtle

Change:

vs:term_status: Added vs:unstable
skos:prefLabel: Added
en-US Hourly
skos:inScheme: Added ceterms:ScheduleFrequency
skos:topConceptOf: Added ceterms:ScheduleFrequency
skos:definition: Added
en-US Schedule is on a hourly basis, typically occurring once per hour.

Reason:

en-US Allow for salaries/wages to be described.

https://github.com/CredentialEngine/Schema-Development/issues/1043

scheduleFrequency:SemiMonthly View Term History: JSON Turtle

Change:

skos:definition: Added
en-US Schedule is on a semi-monthly basis, typically occurring twice per month.
vs:term_status: Added vs:unstable
skos:topConceptOf: Added ceterms:ScheduleFrequency
skos:prefLabel: Added
en-US Semi-Monthly
skos:inScheme: Added ceterms:ScheduleFrequency