Property Glossary

Schema fields can be tagged with an IWA dMRV property path, which is what lets Guardian line up equivalent fields across different schemas and policies.

Guardian supports two versions of that namespace:

IWA v3.0.0	The current specification, released 8 January 2026. Used by every schema created from Guardian 3.7.0 onward.
IWA v1	The original namespace. Kept for every schema created before Guardian 3.7.0.

How a schema picks its version

Each schema carries an iwaVersion tag. A schema with no tag is read as v1 — that is what every schema created before v3 support existed looks like, and it is never reinterpreted as v3.

The tag decides which property list the schema editor offers, so a schema never ends up mixing the two namespaces by accident. It travels with the schema when it is published to Hedera, so importing a published schema into another Guardian instance preserves its version.

Published schemas cannot be changed. Once published, a schema's field properties are frozen on IPFS. A published v1 schema therefore stays on v1 forever; to move it to v3 you create a new version and upgrade that draft.

Upgrading a draft from v1 to v3

A draft schema shows an Upgrade to IWA v3 action. It previews every field before changing anything:

• properties that are the same in both versions are left alone;
• properties v3 renamed or moved are rewritten (69 of them);
• properties v3 removed (33) are cleared and listed, so you can reassign them by hand.

The upgrade is safe to re-run — applying it to an already-upgraded schema changes nothing.

Glossary AI

Guardian can suggest which property to use for each field, instead of picking one by hand from the reference tables below.

In the schema builder, open the Glossary AI tab (next to Fields, Conditions, and Repeatable links). Suggestions load automatically for every field in the schema, scored against the property list for that schema's iwaVersion. Each row shows the field, its current property (if any), and the AI's top match with a confidence score and a short reason. From there:

• Accept applies that property to the field.
• Change jumps to the Fields tab with that field already selected, so you can pick a different property yourself.
• Dismiss clears the row without changing the field.
• Apply all high-confidence accepts every suggestion at or above the confidence threshold shown in the button label, in one click.

A field whose current property already matches the AI's top suggestion shows Already matches instead of an action — nothing to do there.

On a single field, the sparkle button next to the Property dropdown runs the same suggestion for just that field. See more expands the next-best candidates; Move to Glossary AI switches to the full tab with that field's row highlighted.

If AI suggestions aren't available, the tab says so and the Property dropdown keeps working manually, exactly as described above.

What changed in v3

Beyond individual field renames, v3 restructured several areas:

• Extension Sets replace the MRV extension family. MrvExtension, TypedExtension, UntypedExtension and DataExtension are gone. Every mrvExtensions field is now entityExtensions, and methodology-specific data is carried by ExtensionSet, EntityExtension, Formula and Variable.
• VerificationProcessAgreement became OriginationProcessAgreement, and references an ExtensionSet through the new ProjectModule type.
• ImpactClaimCheckpoint became Checkpoint; SpanDataPackage became DataPackage and SdpFile became DataFile.
• Location moved up a level: AccountableImpactOrganization.country and .region now live on ActivityImpactModule.
• Crediting dates became explicit: ImpactClaim gained startDate and endDate.
• 188 property paths are new in v3.

IWA v3.0.0 properties (current)

359 properties. Use these when authoring new schemas.

Property	Label	Notes
AccountableImpactOrganization.id	Organization Identifier
AccountableImpactOrganization.name	Organization Name
AccountableImpactOrganization.description	Organization Description
AccountableImpactOrganization.addresses	Organization Addresses
AccountableImpactOrganization.owners	Organization Owners
AccountableImpactOrganization.informationLink	Information Link
AccountableImpactOrganization.mediaLinks	Media Links
AccountableImpactOrganization.attestations	Attestations
AccountableImpactOrganization.activityImpactModules	Activity Impact Modules
AccountableImpactOrganization.entityExtensions	Entity Extensions	New in v3
Address.addressType	Address Type
Address.addressLines	Address Lines
Address.city	City
Address.state	State/Province
Address.postalCode	Postal Code	New in v3
Address.country	Country
ActivityImpactModule.id	Module Identifier
ActivityImpactModule.aioId	Organization Reference
ActivityImpactModule.isGrouped	Is Grouped	New in v3
ActivityImpactModule.name	Module Name
ActivityImpactModule.classificationCategory	Classification Category
ActivityImpactModule.classificationMethod	Classification Method
ActivityImpactModule.benefitCategory	Benefit Category
ActivityImpactModule.projectScope	Project Scope
ActivityImpactModule.projectType	Project Type
ActivityImpactModule.projectScale	Project Scale
ActivityImpactModule.country	Country	New in v3
ActivityImpactModule.region	Region	New in v3
ActivityImpactModule.arbId	ARB Project Identifier
ActivityImpactModule.geographicLocation	Geographic Location
ActivityImpactModule.firstYearIssuance	First Year of Issuance
ActivityImpactModule.registryProjectId	Registry Project Identifier
ActivityImpactModule.developers	Project Developers
ActivityImpactModule.sponsors	Project Sponsors
ActivityImpactModule.claimSources	Claim Sources
ActivityImpactModule.impactClaims	Impact Claims
ActivityImpactModule.validations	Validations
ActivityImpactModule.attestations	Attestations
ActivityImpactModule.entityExtensions	Entity Extensions	New in v3
ActivityImpactModule.formulaTemplates	Formula Templates	New in v3
ActivityImpactModule.fixedVariables	Fixed Variables	New in v3
Validation.requestDate	Request Date	New in v3
Validation.validationDate	Validation Date
Validation.validatingPartyId	Validating Party Identifier
Validation.validationMethod	Validation Method
Validation.validationExpirationDate	Validation Expiration Date
Validation.validationSteps	Validation Steps
ValidationStep.validationStepName	Validation Step Name
ValidationStep.validationStepDescription	Validation Step Description
ValidationStep.validationStepStatus	Validation Step Status
ValidationStep.stepDocumentLink	Step Document Link	New in v3
ProjectModule.aimId	AIM ID	New in v3
ProjectModule.description	Project Module Description	New in v3
ProjectModule.extensionSetId	Extension Set ID	New in v3
ProjectModule.extensionSetModuleId	Extension Set Module ID	New in v3
ProjectModule.vvbId	VVB ID	New in v3
ProjectModule.verificationPlatformId	Verification Platform ID	New in v3
ClaimSource.id	Claim Source Identifier
ClaimSource.aimId	Activity Impact Module Reference
ClaimSource.name	Claim Source Name
ClaimSource.description	Claim Source Description
ClaimSource.location	Claim Source Location
ClaimSource.sourceType	Source Type
ClaimSource.unitOfMeasure	Unit of Measure
ClaimSource.reportingFrequency	Reporting Frequency	New in v3
ClaimSource.sourceIdentifier	Source Identifier
ClaimSource.entityExtensions	Entity Extensions	New in v3
ClaimSource.variableTemplates	Variable Templates	New in v3
ImpactClaim.id	Impact Claim Identifier
ImpactClaim.aimId	Activity Impact Module Reference
ImpactClaim.processedClaimId	Processed Claim Reference
ImpactClaim.claimGroupId	Claim Group ID	New in v3
ImpactClaim.startDate	Start Date	New in v3
ImpactClaim.endDate	End Date	New in v3
ImpactClaim.unit	Unit of Measure
ImpactClaim.quantity	Quantity
ImpactClaim.co-benefits	Co-Benefits	New in v3
ImpactClaim.checkpoints	Checkpoints
ImpactClaim.entityExtensions	Entity Extensions	New in v3
ImpactClaim.formulas	Formulas	New in v3
Checkpoint.id	Checkpoint ID	New in v3
Checkpoint.claimId	Claim ID	New in v3
Checkpoint.claimSourceIds	Claim Source IDs	New in v3
Checkpoint.projectDeveloperId	Project Developer ID	New in v3
Checkpoint.efBefore	EF Before	New in v3
Checkpoint.efAfter	EF After	New in v3
Checkpoint.checkpointDateRange	Checkpoint Date Range	New in v3
Checkpoint.entityExtensions	Entity Extensions	New in v3
Checkpoint.variables	Variables	New in v3
Checkpoint.dataPackages	Data Packages	New in v3
DataPackage.manifest	Manifest	New in v3
DataPackage.verifiedLinkToCheckpointData	Verified Link to Checkpoint Data	New in v3
Manifest.id	Manifest Identifier
Manifest.version	Manifest Version
Manifest.aioId	AIO ID	New in v3
Manifest.aimId	Activity Impact Module Reference
Manifest.claimId	Claim Identifier
Manifest.processedClaimId	Processed Claim ID	New in v3
Manifest.projectDeveloperId	Project Developer Reference
Manifest.created	Creation Date
Manifest.entityExtensions	Entity Extensions	New in v3
Manifest.files	Files	New in v3
DataFile.name	Data File Name	New in v3
DataFile.type	Data File Type	New in v3
DataFile.description	Data File Description	New in v3
DataFile.claimSourceId	Claim Source ID	New in v3
DataFile.claimSourceAttestation	Claim Source Attestation	New in v3
DataFile.entityExtensions	Entity Extensions	New in v3
ClaimGroup.id	Claim Group ID	New in v3
ClaimGroup.opaId	OPA ID	New in v3
ClaimGroup.name	Claim Group Name	New in v3
ClaimGroup.description	Claim Group Description	New in v3
ClaimGroup.impactClaims	Impact Claims	New in v3
ClaimGroup.processedClaims	Processed Claims	New in v3
ExtensionSet.id	Extension Set ID	New in v3
ExtensionSet.name	Extension Set Name	New in v3
ExtensionSet.version	Extension Set Version	New in v3
ExtensionSet.description	Extension Set Description	New in v3
ExtensionSet.documentation	Documentation	New in v3
ExtensionSet.modules	Modules	New in v3
ExtensionSet.entityExtensionTemplates	Entity Extension Templates	New in v3
ExtensionSet.extensionMessage	Extension Message	New in v3
ExtensionSet.formulaTemplates	Formula Templates	New in v3
ExtensionSet.variableTemplates	Variable Templates	New in v3
ExtensionSetModule.id	Extension Set Module ID	New in v3
ExtensionSetModule.name	Extension Set Module Name	New in v3
ExtensionSetModule.version	Extension Set Module Version	New in v3
ExtensionSetModule.description	Extension Set Module Description	New in v3
ExtensionSetModule.documentation	Documentation	New in v3
ExtensionSetModule.entityExtensionTemplates	Entity Extension Templates	New in v3
ExtensionSetModule.messagePairs	Message Pairs	New in v3
ExtensionSetModule.formulaTemplates	Formula Templates	New in v3
ExtensionSetModule.variableTemplates	Variable Templates	New in v3
MessagePair.id	Message Pair ID	New in v3
MessagePair.name	Message Pair Name	New in v3
MessagePair.version	Message Pair Version	New in v3
MessagePair.description	Message Pair Description	New in v3
MessagePair.documentation	Documentation	New in v3
MessagePair.requestDefinition	Request Definition	New in v3
MessagePair.responseDefinition	Response Definition	New in v3
Message.id	ID	New in v3
Message.messageType	Message Type	New in v3
Message.senderId	Sender ID	New in v3
Message.correlationId	Correlation ID	New in v3
Message.conversationId	Conversation ID	New in v3
Message.closed	Closed	New in v3
Message.message	Message	New in v3
AnyData.protoData	Proto Data	New in v3
AnyData.dataType	Data Type	New in v3
AnyData.value	Value	New in v3
EntityExtensionTemplate.id	Entity Extension Template ID	New in v3
EntityExtensionTemplate.name	Entity Extension Template Name	New in v3
EntityExtensionTemplate.version	Entity Extension Template Version	New in v3
EntityExtensionTemplate.description	Entity Extension Template Description	New in v3
EntityExtensionTemplate.documentation	Documentation	New in v3
EntityExtensionTemplate.extensionContext	Extension Context	New in v3
EntityExtensionTemplate.dataSchemaOrType	Data Schema or Type	New in v3
EntityExtensionTemplate.dataExample	Data Example	New in v3
EntityExtension.id	Entity Extension ID	New in v3
EntityExtension.templateId	Template ID	New in v3
EntityExtension.data	Entity Extension Data	New in v3
EntityExtension.appliedToId	Applied to ID	New in v3
EntityExtension.extensionContext	Extension Context	New in v3
FormulaTemplate.id	Formula Template ID	New in v3
FormulaTemplate.name	Formula Template Name	New in v3
FormulaTemplate.version	Formula Template Version	New in v3
FormulaTemplate.formula	Formula	New in v3
FormulaTemplate.description	Formula Template Description	New in v3
FormulaTemplate.documentation	Documentation	New in v3
FormulaTemplate.dataSchemaOrType	Data Schema or Type	New in v3
FormulaTemplate.dataExample	Data Example	New in v3
FormulaTemplate.variableTemplates	Variable Templates	New in v3
Formula.id	ID	New in v3
Formula.templateId	Template ID	New in v3
Formula.data	Data	New in v3
Formula.variables	Variables	New in v3
Formula.extensionContext	Extension Context	New in v3
VariableTemplate.id	Variable Template ID	New in v3
VariableTemplate.name	Variable Template Name	New in v3
VariableTemplate.version	Variable Template Version	New in v3
VariableTemplate.description	Variable Template Description	New in v3
VariableTemplate.documentation	Documentation	New in v3
VariableTemplate.alias	Alias	New in v3
VariableTemplate.dataSchemaOrType	Data Schema or Type	New in v3
VariableTemplate.dataExample	Data Example	New in v3
Variable.id	ID	New in v3
Variable.templateId	Template ID	New in v3
Variable.data	Data	New in v3
Variable.claimSourceId	Claim Source ID	New in v3
Variable.extensionContext	Extension Context	New in v3
ProcessedClaim.id	Processed Claim Identifier
ProcessedClaim.opaId	OPA ID	New in v3
ProcessedClaim.impactClaimId	Impact Claim Reference
ProcessedClaim.claimGroupId	Claim Group ID	New in v3
ProcessedClaim.creditId	Credit Identifier
ProcessedClaim.unit	Unit of Measure
ProcessedClaim.quantity	Quantity
ProcessedClaim.co-benefits	Co-Benefits	New in v3
ProcessedClaim.formulas	Formulas	New in v3
ProcessedClaim.checkpointResults	Checkpoint Results
ProcessedClaim.entityExtensions	Entity Extensions	New in v3
ProcessedClaim.issuanceRequest	Issuance Request
CheckpointResult.id	Checkpoint Result Identifier
CheckpointResult.checkpointId	Checkpoint Identifier
CheckpointResult.verifiedLinkToProcessDataResult	Verified Link to Process Data Result	New in v3
CheckpointResult.dateRange	Date Range
CheckpointResult.efBefore	Emissions Factor Before
CheckpointResult.efAfter	Emissions Factor After
CheckpointResult.status	Checkpoint Result Status	New in v3
CheckpointResult.comment	Comment	New in v3
CheckpointResult.variables	Variables	New in v3
CheckpointResult.entityExtensions	Entity Extensions	New in v3
OriginationProcessAgreement.id	Agreement ID	New in v3
OriginationProcessAgreement.name	Agreement Name	New in v3
OriginationProcessAgreement.description	Agreement Description	New in v3
OriginationProcessAgreement.projectModules	Project Modules	New in v3
OriginationProcessAgreement.signatories	Signatories	New in v3
OriginationProcessAgreement.qualityStandard	Quality Standard	New in v3
OriginationProcessAgreement.mrvRequirements	MRV Requirements	New in v3
OriginationProcessAgreement.agreementDate	Agreement Date	New in v3
OriginationProcessAgreement.estimatedAnnualCredits	Estimated Annual Credits	New in v3
OriginationProcessAgreement.AuditSchedule	Audit Schedule	New in v3
OriginationProcessAgreement.Audits	Audits	New in v3
OriginationProcessAgreement.entityExtensions	Entity Extensions	New in v3
CRU.id	Carbon Removal Unit Identifier