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+## Mapping
+
+This is the mapping between ISA-json types defined in https://isa-specs.readthedocs.io/en/latest/isajson.html and [`schema.org`](https://schema.org/)-types used by the  isa-ro-crate-profile defined in https://github.com/nfdi4plants/isa-ro-crate-profile/blob/main/profile/isa_ro_crate.md .
+
+| ISA term | schema term | Explanation |
+|----------|-------------|-------------|
+|[Investigation](https://isa-specs.readthedocs.io/en/latest/isajson.html#investigation-schema-json)|[Dataset](https://schema.org/Dataset)||
+|@id|@id||
+|-|additionalType|for distinction from Study and Assay|
+|fileName|url||
+|title|headline||
+|people|creator||
+|identifier|identifier||
+|description|description||
+|studies|hasPart||
+|submissionDate|dateCreated||
+|-|dateModified||
+|publicReleaseDate|datePublished||
+|publications|citation||
+|comments|comment||
+|onntologySourceReferences|mentions||
+||
+|[Study](https://isa-specs.readthedocs.io/en/latest/isajson.html#study-schema-json)|[Dataset](https://schema.org/Dataset)||
+|@id|@id||
+|-|additionalType|for distinction from Investigation and Assay|
+|fileName|url||
+|people|creator||
+|identifier|identifier||
+|title|headline||
+|assays|hasPart||
+|processSequence|about||
+|description|description||
+|submissionDate|dateCreated||
+|-|dateModified||
+|publicReleaseDate|datePublished||
+|publications|citation||
+|comments|comment||
+|studyDesignDescriptor|-|redundant information|
+|protocols|-|redundant information|
+|materials|-|redundant information|
+|factors|-|redundant information|
+|characteristicCategories|-|redundant information|
+|unitCategories|-|redundant information|
+||
+|[Assay](https://isa-specs.readthedocs.io/en/latest/isajson.html#assay-schema-json)|[Dataset](https://schema.org/Dataset)||
+|@id|@id||
+|-|additionalType|for distinction from Investigation and Study|
+|-|identifier||
+|processSequence|about||
+|-|creator|ARC-specific property|
+|technologyType|measurementMethod||
+|technologyPlatform|measurementTechnique||
+|dataFiles|hasPart||
+|measurementType|variableMeasured||
+|comments|comment||
+|fileName|url||
+||
+|[Process](https://isa-specs.readthedocs.io/en/latest/isajson.html#process-schema-json)|[bioschemas.org/LabProcess](https://bioschemas.org/LabProcess)|
+|@id|@id||
+|name|name||
+|performer|agent||
+|inputs|object||
+|outputs|result||
+|executesProtocol|executesLabProtocol||
+|parameterValues|parameterValue||
+|date|endTime||
+|previousProcess|-|redundant information|
+|nextProcess|-|redundant information|
+|comments|disambiguatingDescription||
+||
+|[Protocol](https://isa-specs.readthedocs.io/en/latest/isajson.html#protocol-schema-json)|[bioschemas.org/LabProtocol](https://bioschemas.org/LabProtocol)|
+|@id|@id||
+|name|name||
+|protocolType|intendedUse||
+|description|description||
+|uri|url||
+|-|comment|ARC-specific property|
+|version|version||
+|components|labEquipment|Components can be saved as `labEquipment`, `reagent`, or `computationalTool`, with `labEquipment` being the default.|
+|components|reagent|Components can be saved as `labEquipment`, `reagent`, or `computationalTool`, with `labEquipment` being the default.|
+|components|computationalTool|Components can be saved as `labEquipment`, `reagent`, or `computationalTool`, with `labEquipment` being the default.|
+|parameters|-|redundant information|
+||
+|[Sample](https://isa-specs.readthedocs.io/en/latest/isajson.html#sample-schema-json)|[bioschemas.org/Sample](https://bioschemas.org/Sample)||
+|[Source](https://isa-specs.readthedocs.io/en/latest/isajson.html#source-schema-json)|[bioschemas.org/Sample](https://bioschemas.org/Sample)||
+|@id|@id||
+|name|name||
+|characteristics|additionalProperty|Characteristics and factor values can be saved as `additionalProperties`. What they represent needs to be annotated.|
+|factorValues|additionalProperty|Characteristics and factor values can be saved as `additionalProperties`. What they represent needs to be annotated.|
+|derivesFrom|-|redundant information|
+||
+|[Data](https://isa-specs.readthedocs.io/en/latest/isajson.html#data-schema-json)|'File' or '[MediaObject](https://schema.org/MediaObject)'|
+|@id|@id||
+|name|name||
+|comments|comment||
+|-|encodingFormat|ARC-specific property|
+|type|disambiguatingDescription||
+||
+|[Person](https://isa-specs.readthedocs.io/en/latest/isajson.html#person-schema-json)|[schema.org/Person](https://schema.org/Person)|
+|@id|@id||
+|firstName|givenName||
+|lastName|familyName||
+|email|email||
+|-|identifier|Can be used for identifiers stored in comment, e.g. an orcid.|
+|affiliation|affiliation|The affilitation strin in ISA is converted to an Oranization object.|
+|roles|jobTitle||
+|midInitials|additionalName||
+|address|address||
+|phone|telephone||
+|fax|faxNumber||
+|comments|disambiguatingDescription|Comment object in ISA has to be encoded as a string.|
+||
+|[Publication](https://isa-specs.readthedocs.io/en/latest/isajson.html#publication-schema-json)|[schema.org/ScholarlyArticle](https://schema.org/ScholarlyArticle)|
+|@id|@id||
+|title|headline||
+|pubMedID|identifier|One or many identifiers for this article (DOI or PubMedID) can be encoded in identifier. Either as full URL or of type PropertyValue to indicate the kind of reference.|
+|doi|identifier|One or many identifiers for this article (DOI or PubMedID) can be encoded in identifier. Either as full URL or of type PropertyValue to indicate the kind of reference.|
+|authorList|author||
+|status|creativeWorkStatus|
+|comments|comment||
+||
+|[Comment](https://isa-specs.readthedocs.io/en/latest/isajson.html#comment-schema-json)|[Comment](https://schema.org/Comment)||
+|@id|@id||
+|name|name||
+|value|text||
+||
+|[OntologyAnnotation](https://isa-specs.readthedocs.io/en/latest/isajson.html#ontology-annotation-schema-json)|[DefinedTerm](https://schema.org/DefinedTerm)||
+|annotationValue|name||
+|termSource|inDefinedTermSet||
+|termAccession|termCode||
+|comments|disambiguatingDescription|Comment object in ISA has to be encoded as a string.|
+||
+|[FactorValue](https://isa-specs.readthedocs.io/en/latest/isajson.html#factor-value-schema-json)|[schema.org/PropertyValue](https://schema.org/PropertyValue)|See details for properties [below](#key-value-unit-triples).|
+|[MaterialAttributeValue](https://isa-specs.readthedocs.io/en/latest/isajson.html#material-attribute-value-schema-json)|[schema.org/PropertyValue](https://schema.org/PropertyValue)|See details for properties [below](#key-value-unit-triples).|
+|[ProcessParameterValue](https://isa-specs.readthedocs.io/en/latest/isajson.html#process-parameter-value-schema-json)|[schema.org/PropertyValue](https://schema.org/PropertyValue)|See details for properties [below](#key-value-unit-triples).|
+||
+|[OntologySourceReference](https://isa-specs.readthedocs.io/en/latest/isajson.html#ontology-source-reference-schema-json)|-|dropped type|
+|[Factor](https://isa-specs.readthedocs.io/en/latest/isajson.html#factor-schema-json)|-|dropped type|
+|[Material](https://isa-specs.readthedocs.io/en/latest/isajson.html#material-schema-json)|-|dropped type|
+|[ProtocolParameter](https://isa-specs.readthedocs.io/en/latest/isajson.html#protocol-parameter-schema-json)|-|dropped type|
+|[MaterialAttribute](https://isa-specs.readthedocs.io/en/latest/isajson.html#material-attribute-schema-json)|-|dropped type|
+
+### Key-Value-Unit Triples
+
+The three types `MaterialAttributeValue`, `FactorValue` and `ProcessParameterValueValue` are all encoded as a [schema.org/PropertyValue](https://schema.org/PropertyValue).
+All three represent a key-value-unit triple, with the key (`category`) essentially being an ontology term (of type `Factor`,`MaterialAttribute`,`ProtocolParameter`).
+The key ontology term is always encoded as a URL and a name and therefore have to be resolved on export.
+The value field is encoded in a straight-forward manner.
+The unit is again an ontology term that has to be resolved into a URL and a name.
+
+| ISA term | schema term | Explanation |
+|----------|-------------|-------------|
+|[MaterialAttributeValue](https://isa-specs.readthedocs.io/en/latest/isajson.html#material-attribute-value-schema-json)|[schema.org/PropertyValue](https://schema.org/PropertyValue)||
+|[FactorValue](https://isa-specs.readthedocs.io/en/latest/isajson.html#factor-value-schema-json)|[schema.org/PropertyValue](https://schema.org/PropertyValue)||
+|[ProcessParameterValue](https://isa-specs.readthedocs.io/en/latest/isajson.html#process-parameter-value-schema-json)|[schema.org/PropertyValue](https://schema.org/PropertyValue)||
+|@id|@id||
+|category|name|Name of the category.|
+|value|value|Value as number or string.|
+|category|propertyID|Ontology URL of the category.|
+|unit|unitCode|Ontology URL of the unit.|
+|unit|unitText|Name of the unit.|
+|value|valueReference|Ontology URL or ontology term objetc of the value.|
+|-|additionalType||Can be used to describe if the value is a factor, characteristic or parameter.|
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