H2KG Ontology

Alignment

EMMO-aligned ontology for hydrogen electrochemical systems, experiments, materials, measurements, and FAIR metadata

H2KG Ontology logoOntology release

Developed through DECODE, the Helmholtz Metadata Collaboration (HMC), and AIMWORKS to support FAIR ontology publication and reusable metadata infrastructure for hydrogen electrochemical systems.

HMCAIMWORKS

Accepted Alignments

19 review-ready mappings are included in the published alignment layer.

Exploratory Candidates

1133 exploratory candidates are kept out of the published TTL and remain internal review material only.

Agent

https://w3id.org/h2kg/hydrogen-ontology#Agent

rdfs:subClassOf http://www.w3.org/ns/prov#Agent

Agent should remain local while anchored in PROV-O.

Carbon Dioxide

https://w3id.org/h2kg/hydrogen-ontology#CarbonDioxide

skos:exactMatch http://purl.obolibrary.org/obo/CHEBI_16526

Carbon dioxide is an unambiguous chemical entity that should align directly to ChEBI.

Ethanol

https://w3id.org/h2kg/hydrogen-ontology#Ethanol

skos:exactMatch http://purl.obolibrary.org/obo/CHEBI_16236

Ethanol is an unambiguous chemical entity that should align directly to ChEBI.

FTIR Dataset

https://w3id.org/h2kg/hydrogen-ontology#FTIRDataset

rdfs:subClassOf https://purls.helmholtz-metadaten.de/hob/HDO_00002013

Conservative HDO anchoring favors specialization only for true data-governance and metadata-management concepts.

Formic Acid

https://w3id.org/h2kg/hydrogen-ontology#FormicAcid

skos:exactMatch http://purl.obolibrary.org/obo/CHEBI_30751

Formic acid is an unambiguous chemical entity that should align directly to ChEBI.

Hydrazine

https://w3id.org/h2kg/hydrogen-ontology#Hydrazine

skos:exactMatch http://purl.obolibrary.org/obo/CHEBI_18280

Hydrazine is an unambiguous chemical entity that should align directly to ChEBI.

Hydrochloric Acid

https://w3id.org/h2kg/hydrogen-ontology#HydrochloricAcid

skos:exactMatch http://purl.obolibrary.org/obo/CHEBI_17883

Hydrochloric acid is an unambiguous chemical entity that should align directly to ChEBI.

Hydrofluoric Acid

https://w3id.org/h2kg/hydrogen-ontology#HydrofluoricAcid

skos:exactMatch http://purl.obolibrary.org/obo/CHEBI_29241

Hydrofluoric acid is an unambiguous chemical entity that should align directly to ChEBI.

Measurement

https://w3id.org/h2kg/hydrogen-ontology#Measurement

rdfs:subClassOf https://w3id.org/emmo/domain/electrochemistry#electrochemistry_7729c34e_1ae9_403d_b933_1765885e7f29

Measurement is better treated as a local specialization of electrochemical measurement practice.

Metadata

https://w3id.org/h2kg/hydrogen-ontology#Metadata

rdfs:subClassOf https://purls.helmholtz-metadaten.de/hob/HDO_00000029

Conservative HDO anchoring favors specialization only for true data-governance and metadata-management concepts.

Metadata

https://w3id.org/h2kg/hydrogen-ontology#Metadata

skos:closeMatch https://purls.helmholtz-metadaten.de/hob/HDO_00001036

Filtered HDO lexical similarity suggests a review-worthy soft alignment for a true data or metadata concept.

Microstructure Image Dataset

https://w3id.org/h2kg/hydrogen-ontology#MicrostructureImageDataset

skos:closeMatch https://purls.helmholtz-metadaten.de/hob/HDO_00000005

Filtered HDO lexical similarity suggests a review-worthy soft alignment for a true data or metadata concept.

PEMFCCFD Simulation

https://w3id.org/h2kg/hydrogen-ontology#PEMFCCFDSimulation

skos:closeMatch https://purls.helmholtz-metadaten.de/hob/HDO_00001069

Filtered HDO lexical similarity suggests a review-worthy soft alignment for a true data or metadata concept.

Potassium Hydroxide

https://w3id.org/h2kg/hydrogen-ontology#PotassiumHydroxide

skos:exactMatch http://purl.obolibrary.org/obo/CHEBI_32035

Potassium hydroxide is an unambiguous chemical entity that should align directly to ChEBI.

Process

https://w3id.org/h2kg/hydrogen-ontology#Process

owl:equivalentClass https://w3id.org/emmo#EMMO_process

High lexical similarity and compatible kind support a strong equivalence proposal.

Property

https://w3id.org/h2kg/hydrogen-ontology#Property

owl:equivalentClass https://w3id.org/emmo#EMMO_property

High lexical similarity and compatible kind support a strong equivalence proposal.

Water

https://w3id.org/h2kg/hydrogen-ontology#Water

skos:exactMatch http://purl.obolibrary.org/obo/CHEBI_15377

Water is an unambiguous chemical entity that should align directly to ChEBI.

hasIdentifier

https://w3id.org/h2kg/hydrogen-ontology#hasIdentifier

rdfs:subPropertyOf http://purl.org/dc/terms/identifier

Conservative anchoring favors specialization over strict equivalence.

hasQuantityValue

https://w3id.org/h2kg/hydrogen-ontology#hasQuantityValue

rdfs:subPropertyOf http://qudt.org/schema/qudt/quantityValue

Quantity-value relations should reuse QUDT semantics where possible.