RML Execution Report (RER) Vocabulary

Abstract

The RML Execution Report (RER) is a machine-readable report that makes mapping execution issues and outcomes transparent for RML authors and tooling, with contextual information.

Cross-reference for RML Execution Report (RER) Vocabulary classes, object properties and data properties back to ToC

This section provides details for each class and property defined by RML Execution Report (RER) Vocabulary.

Classes

RML Execution Report
Statement part
Log
Information
Warning
Unrecognized Term
Deprecated Feature
Error
Configuration Error
Mapping Error
Execution Error
Cannot Read Mapping Document
Data Error
Datatype
Datatype Expectation Error
Function Execution Error
Generated Statement Per Triples Map
Generated Statements Per Target
Ill-typed Literal Error
Incorrect Term Type
Invalid IRI
Invalid Language Tag Error
Invalid Output RDF
Invalid URI
Logical Source Error
Logical Target
Missing Dependency
No Triples Map
Not Well-formed Language Tag
Out Of Memory
Out Of Spec
Parsing Error
Point
Predicate Not Reifiable
Range
RDF Mapping Syntax Error
Reference Formulation
Reference Formulation Error
Reference Formulation Execution Error
Reference Formulation Syntax Error
Source Access Error
Statement part descriptor
Term Type
Triples Map
Type Conversion Error
Unexpected Error
Unparseable Data Error
Unsupported Function
Unsupported Mapping

RML Execution Report^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#RmlExecutionReport

A report generated by an RML Processor.

Is defined by: https://w3id.org/dre/rer#

Example

[] a rer:RmlExecutionReport
	rer:isSuccess false;
    rer:isComplete false;

    rer:processorName "BURP";
    rer:processorVersion "0.1.2";
	
    rer:generatedStatements 0;
    rer:generatedStatementsPerTriplesMap [
        rer:triplesMap <PersonTM>
        rer:generatedStatements 0
    ];
    rer:generatedStatementsPerTriplesMap [
        rer:triplesMap <MovieTM>
        rer:generatedStatements 0
    ];

	rer:hasErrors [
		rer:timestamp "2025-11-26+13:20:00"^xsd:dateTime
		a rer:ReferenceFormulationExecutionError
		rer:message "Execution Error in JSONPath `$.film.title.value`."
		rer:reference "$.film.title.value"
		rer:referenceFormulation rml:JSONPath
		rer:iteration "{film:{title:'A film title'}}"
		rer:stackTrace "A java stack trace"
		rer:mappingStatement [
			ptr:statement <<:a0 rml:template "$.film.title.value`.">>;
			ptr:part ptr:object
		];
	].

is in domain of: generated statements ^dp, generated statements per Triples Map ^op, generated statements per target ^op, has error ^op, has log ^op, is complete ^dp, is success ^dp, number of triples map ^dp, processor name ^dp, processor version ^dp

Statement part^c back to ToC or Class ToC

IRI: https://w3id.org/dre/ptr#StatementPart

Wrapper describing which part of an RDF statement is implicated.

Is defined by: https://w3id.org/dre/ptr#

is in domain of: part ^op, statement ^op, text range ^op
is in range of: mapping statement ^op

Log^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#Log

A log message produced during RML processor execution, look at subClasses for the gravity definition. (Information < Warning < Error)

Is defined by: https://w3id.org/dre/rer#

has sub-classes: Error ^c, Information ^c, Warning ^c
is in domain of: Potential Cause ^ap, Potential Confusion ^ap, Potential Confusion Error ^ap, Potential Solution ^ap, Suggested Context ^ap, Timestamp of the log message. ^dp, iteration data ^dp, iteration index ^dp, mapping statement ^op, message ^dp, order ^dp, stack trace ^dp
is in range of: Potential Confusion Error ^ap, has log ^op

Information^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#Information

A information from the RML processor.

Is defined by: https://w3id.org/dre/rer#

has super-classes: Log ^c

Warning^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#Warning

A warning that occurred during the RML processor execution.

Is defined by: https://w3id.org/dre/rer#

has super-classes: Log ^c
has sub-classes: Deprecated Feature ^c, Unrecognized Term ^c

Unrecognized Term^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#UnrecognizedTerm

The engine encountered a property or class in the RML namespace it does not recognize.

Potential Cause: This could be a typo in the mapping or a feature from a newer RML version this engine does not know.
Potential Solution: Check for typos in the term. If it is correct, this engine may be outdated.

Is defined by: https://w3id.org/dre/rer#

has super-classes: Warning ^c

Deprecated Feature^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#DeprecatedFeature

The mapping uses a deprecated RML feature.

Potential Cause: The mapping employs a term or construct that has been marked as deprecated in the RML specification or processor.
Potential Solution: Update the mapping to use the recommended alternative constructs as per the latest RML specification.

Is defined by: https://w3id.org/dre/rer#

has super-classes: Warning ^c

Error^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#Error

An error that occurred during the RML processor execution.

Potential Cause: An unexpected situation occurred during mapping execution or validation.
Potential Solution: Inspect the error details, mapping definition and source data to identify the root cause.
Potential Confusion: Do not confuse this generic error with more specific subclasses that provide finer diagnostics.

Is defined by: https://w3id.org/dre/rer#

has super-classes: Log ^c
has sub-classes: Configuration Error ^c, Execution Error ^c, Mapping Error ^c, Parsing Error ^c, Reference Formulation Error ^c, Unexpected Error ^c
is in domain of: has source data ^op, mapping node ^op, plan node ^op
is in range of: has error ^op

Configuration Error^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#ConfigurationError

Errors related to engine or environment configuration.

Potential Cause: Required configuration options, environment variables, or parameters are missing, invalid, or inconsistent.
Potential Solution: Review engine configuration, command line parameters, and environment variables; fix invalid values and provide missing ones.
Potential Confusion: Do not confuse with Mapping Error (mapping definition is wrong) or Execution Error (data-related issues).

Is defined by: https://w3id.org/dre/rer#

has super-classes: Error ^c
has sub-classes: Cannot Read Mapping Document ^c, Missing Dependency ^c

Mapping Error^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#MappingError

Errors related to the mapping definition itself. Changing input data or configuration will not make it work.

Potential Cause: The RML mapping is invalid.
Potential Solution: Changing the mapping.
Potential Confusion: The error is not due to the data in which case it is probably an Execution Error or Configuration Error.
Potential Confusion Error: Configuration Error ^c

Is defined by: https://w3id.org/dre/rer#

has super-classes: Error ^c
has sub-classes: No Triples Map ^c, Out Of Spec ^c, RDF Mapping Syntax Error ^c, Reference Formulation Syntax Error ^c, Unsupported Mapping ^c

Execution Error^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#ExecutionError

Errors related to the execution of a mapping (plan) with real data

Potential Cause: Hypothesis on data may be incorrect
Potential Solution: If the data are correct then adapt setup to handle that case else change the data
Potential Confusion: Distinguish it from errors that could be captured with static analysis alone.
Potential Confusion Error: Mapping Error ^c

Is defined by: https://w3id.org/dre/rer#

has super-classes: Error ^c
has sub-classes: Data Error ^c, Function Execution Error ^c, Logical Source Error ^c, Out Of Memory ^c, Reference Formulation Execution Error ^c, Source Access Error ^c

Cannot Read Mapping Document^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#CannotReadMappingDocument

The mapping document cannot be read (e.g. missing file, insufficient permissions, unreadable stream).

Potential Cause: Wrong path or URI to the mapping file, missing file, or insufficient file system / network permissions.
Potential Solution: Verify that the mapping path/URI is correct, the resource exists and the process has sufficient permissions to read it.
Potential Confusion: Do not confuse with RDF Mapping Syntax Error; here the mapping cannot be read at all, not parsed.

Is defined by: https://w3id.org/dre/rer#

has super-classes: Configuration Error ^c

Data Error^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#DataError

The obtained data is problematic.

Potential Cause: Input data does not match the assumptions of the mapping or reference formulation.
Potential Solution: Validate and clean the input data, or adapt the mapping to handle the observed data patterns.
Potential Confusion: May be mistaken for a mapping error, but the mapping is valid and the data itself is problematic.
Potential Confusion Error: Mapping Error ^c

Is defined by: https://w3id.org/dre/rer#

has super-classes: Execution Error ^c
has sub-classes: Datatype Expectation Error ^c, Ill-typed Literal Error ^c, Invalid Output RDF ^c, Type Conversion Error ^c, Unparseable Data Error ^c
is in domain of: Data ^dp, Data Type ^op

Datatype^c back to ToC or Class ToC

IRI: http://www.w3.org/2000/01/rdf-schema#Datatype

is in range of: Data Type ^op, Expected Data Type ^op

Datatype Expectation Error^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#DatatypeExpectationError

Errors where a value violates an expected datatype.

Is defined by: https://w3id.org/dre/rer#

has super-classes: Data Error ^c
has sub-classes: Ill-typed Literal Error ^c, Type Conversion Error ^c
is in domain of: Expected Data Type ^op

Function Execution Error^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#FunctionExecutionError

An error that occurs while executing a function during mapping evaluation.

Potential Cause: The function implementation raised an exception or received invalid arguments during execution.
Potential Solution: Inspect the function definition, arguments and implementation; fix invalid inputs or implementation bugs.
Potential Confusion: Type Conversion Error could be an alternative when we precisely know that's the issue.
Potential Confusion Error: Type Conversion Error ^c

Is defined by: https://w3id.org/dre/rer#

has super-classes: Execution Error ^c

Generated Statement Per Triples Map^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#GeneratedStatementPerTriplesMap

Statistics about the number of generated statements for a specific Triples Map.

Is defined by: https://w3id.org/dre/rer#

is in domain of: generated statements ^dp, triples map ^op
is in range of: generated statements per Triples Map ^op

Generated Statements Per Target^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#GeneratedStatementsPerTarget

Statistics about the number of generated statements for a specific Logical Target.

Is defined by: https://w3id.org/dre/rer#

is in domain of: generated statements ^dp, target ^op
is in range of: generated statements per target ^op

Ill-typed Literal Error^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#IllTypedLiteralError

The value of a typed literal is not valid according to the datatype.

Potential Solution: Fix the value of the typed literal to be valid according to the datatype or update the datatype to match the actual value, you may also leave the datatype empty to let the engine infer it.

Is defined by: https://w3id.org/dre/rer#

has super-classes: Data Error ^c, Datatype Expectation Error ^c

Incorrect Term Type^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#IncorrectTermType

The term type of a term is not the expected one.

Potential Cause: The mapping specifies a term type (IRI, blank node, literal) inconsistent with the position or constraints in the target RDF model.
Potential Solution: Adjust the mapping term type or target constraints so that subject, predicate and object positions use valid term types.
Potential Confusion: May be confused with Type Conversion Error; here term type is wrong, not the lexical value datatype.
Potential Confusion Error: Type Conversion Error ^c

Is defined by: https://w3id.org/dre/rer#

has super-classes: Out Of Spec ^c
is in domain of: allowed term types ^op

Invalid IRI^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#InvalidIRI

An error indicating that a generated IRI is syntactically invalid [RFC3987] or not allowed.

Potential Cause: The mapping constructs IRIs by concatenation or templating that yields illegal characters or structure.
Potential Solution: Validate IRI templates and input values; encode or sanitize components before building IRIs.
Potential Confusion: May be confused with Predicate Not Reifiable; here the issue is invalid syntax of the IRI itself.
Potential Confusion Error: Invalid URI ^c

Is defined by: https://w3id.org/dre/rer#

has super-classes: Invalid Output RDF ^c

Invalid Language Tag Error^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#InvalidLanguageTagError

The language tag of a literal is not valid according to the BCP47 specification.

Potential Confusion: May be confused with Not Well-formed Language Tag; if the tag is well-formed but not recognized.
Potential Confusion Error: Not Well-formed Language Tag ^c

Is defined by: https://w3id.org/dre/rer#

has super-classes: Invalid Output RDF ^c
has sub-classes: Not Well-formed Language Tag ^c
is in domain of: language tag ^dp

Invalid Output RDF^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#InvalidOutputRDF

An error indicating that the produced RDF graph is invalid.

Potential Cause: The mapping generates RDF terms or statements that violate the RDF data model.
Potential Solution: Review the mapping rules and output constraints to ensure only valid RDF terms and structures are produced.
Potential Confusion: This error is not for mapping file with errors in the RDF serialization format, these should be Mapping Syntax Error.
Potential Confusion Error: RDF Mapping Syntax Error ^c

Is defined by: https://w3id.org/dre/rer#

has super-classes: Data Error ^c
has sub-classes: Invalid IRI ^c, Invalid Language Tag Error ^c, Invalid URI ^c, Predicate Not Reifiable ^c

Invalid URI^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#InvalidURI

An error indicating that a generated URI is syntactically invalid [RFC3986] or not allowed.

Potential Cause: The mapping constructs URIs by concatenation or templating that yields illegal characters or structure.
Potential Solution: Validate URI templates and input values; encode or sanitize components before building URIs.
Potential Confusion: May be confused with Predicate Not Reifiable; here the issue is invalid syntax of the URI itself.
Potential Confusion Error: Invalid IRI ^c

Is defined by: https://w3id.org/dre/rer#

has super-classes: Invalid Output RDF ^c

Logical Source Error^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#LogicalSourceError

Error while obtaining an iteration or iterating over a source.

Potential Cause: The reference formulation, iterator, is incompatible
Potential Solution: Review the logical source, reference formulation and iterator expression to ensure they are compatible with the actual source structure.
Potential Confusion: May be confused with Reference Formulation Execution Error, which relates to value extraction rather than iteration.
Potential Confusion Error: Reference Formulation Execution Error ^c

Is defined by: https://w3id.org/dre/rer#

has super-classes: Execution Error ^c

Logical Target^c back to ToC or Class ToC

IRI: http://w3id.org/rml#LogicalTarget

is in range of: target ^op

Missing Dependency^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#MissingDependency

A required library, plugin, external tool or service is not available at runtime.

Potential Cause: The engine was started without installing or enabling a required dependency.
Potential Solution: Install and enable the missing dependency, update the classpath/module-path, or configure the engine to use an available alternative.
Potential Confusion: May be confused with Unsupported Function, which refers to a function not implemented even when dependencies are present.

Is defined by: https://w3id.org/dre/rer#

has super-classes: Configuration Error ^c

No Triples Map^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#NoTriplesMap

No triples map found in the graph.

Potential Cause: The mapping file is empty or contains no resources recognized as TriplesMap
Potential Solution: Ensure that the mapping defines at least one Triples Map with the correct IRIs and prefixes.
Potential Confusion: May be confused with Source Access Error; here the source may be fine but no mapping is defined to use it.
Potential Confusion Error: Source Access Error ^c

Is defined by: https://w3id.org/dre/rer#

has super-classes: Mapping Error ^c

Not Well-formed Language Tag^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#NotWellFormedLanguageTagError

The language tag attached to a literal does not conform to BCP47 syntax (malformed tag).

Potential Cause: The language tag contains invalid subtags or illegal characters that violate BCP47.
Potential Solution: Correct the language tag to a valid BCP47 value or remove the tag to let the engine infer it.
Potential Confusion: May be confused with Invalid Language Tag Error; here the tag is syntactically invalid, whereas in Invalid Language Tag Error the tag is well-formed but not recognized.
Potential Confusion Error: Invalid Language Tag Error ^c
Suggested Context: Data ^dp

Is defined by: https://w3id.org/dre/rer#

has super-classes: Invalid Language Tag Error ^c

Out Of Memory^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#OutOfMemory

The engine ran out of memory while executing a mapping or producing results.

Potential Cause: Input data is too large, processing is not streamed, or memory limits for the process/VM are too low.
Potential Solution: Increase memory limits, enable streaming or chunked processing, or split the job into smaller executions.
Potential Confusion: Do not confuse with Source Access Error; here the problem is resource exhaustion, not reaching the source.

Is defined by: https://w3id.org/dre/rer#

has super-classes: Execution Error ^c

Out Of Spec^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#OutOfSpec

The mapping contains constructs that that violate the RML specification (e.g., two logical sources), regardless of the engine.

Potential Cause: A cardinality violation, usage of a property on the wrong class, or an invalid literal value for a configuration property. Likely to be caught by the shapes.
Potential Solution: Refactor the mapping to adhere to the RML specification constraints. Validating the mapping against SHACL shapes usually reveals the fix.
Potential Confusion: May be confused with Unsupported Mapping: An Out Of Spec error indicates the mapping is objectively invalid and should not work on any compliant processor.
Potential Confusion Error: Unsupported Mapping ^c

Is defined by: https://w3id.org/dre/rer#

has super-classes: Mapping Error ^c
has sub-classes: Incorrect Term Type ^c

Parsing Error^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#SyntaxError

Errors related to the parsing of a mapping definition.

Potential Cause: The mapping definition is invalid.
Potential Solution: Fix the mapping definition.

Is defined by: https://w3id.org/dre/rer#

has super-classes: Error ^c
has sub-classes: RDF Mapping Syntax Error ^c, Reference Formulation Syntax Error ^c, Unparseable Data Error ^c

Point^c back to ToC or Class ToC

IRI: https://w3id.org/dre/ptr#Point

Line/column coordinates inside a text.

Is defined by: https://w3id.org/dre/ptr#

is in domain of: column ^dp, line ^dp
is in range of: end ^op, start ^op

Predicate Not Reifiable^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#PredicateNotReifiable

An error indicating that a predicate used in the mapping cannot be reified as required.

Potential Cause: The mapping attempts to reify a predicate that is reserved, unsupported or structurally incompatible with reification.
Potential Solution: Adapt the mapping to use a different predicate or another representation that does not require reification.
Potential Confusion: Do not confuse with Invalid IRI, which is about syntactic invalidity of the IRI, not reifiability.
Potential Confusion Error: Invalid IRI ^c

Is defined by: https://w3id.org/dre/rer#

has super-classes: Invalid Output RDF ^c

Range^c back to ToC or Class ToC

IRI: https://w3id.org/dre/ptr#Range

Text span defined by start and end points.

Is defined by: https://w3id.org/dre/ptr#

is in domain of: end ^op, start ^op
is in range of: text range ^op

RDF Mapping Syntax Error^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#RDFMappingSyntaxError

Error in the RDF Serialization of the mapping.

Potential Cause: The mapping file contains invalid RDF syntax or serialization errors.
Potential Solution: Validate and fix the RDF syntax using an RDF parser or validator before running the engine.
Potential Confusion: Do not confuse with Invalid Output RDF, which refers to invalid generated RDF data rather than mapping syntax.
Potential Confusion Error: Invalid Output RDF ^c

Is defined by: https://w3id.org/dre/rer#

has super-classes: Mapping Error ^c, Parsing Error ^c

Reference Formulation^c back to ToC or Class ToC

IRI: http://w3id.org/rml#ReferenceFormulation

is in range of: reference formulation ^op

Reference Formulation Error^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#ReferenceFormulationError

Errors related to the reference formulation used in the mapping.

Is defined by: https://w3id.org/dre/rer#

has super-classes: Error ^c
has sub-classes: Reference Formulation Execution Error ^c, Reference Formulation Syntax Error ^c
is in domain of: reference ^dp, reference formulation ^op

Reference Formulation Execution Error^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#ReferenceFormulationExecutionError

Failed to extract a value from the source data using the provided reference formulation.

Potential Cause: The reference expression is incorrect or does not match the current iteration context.
Potential Solution: Check and correct the reference expression so it matches the structure and naming of the source data.
Potential Confusion: Can be confused with Logical Source Error; here iteration works but the value extraction expression fails.
Potential Confusion Error: Logical Source Error ^c
Suggested Context: iteration data ^dp

Is defined by: https://w3id.org/dre/rer#

has super-classes: Execution Error ^c, Reference Formulation Error ^c

Reference Formulation Syntax Error^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#ReferenceFormulationSyntaxError

An error indicating that the reference formulation expression in the mapping has invalid syntax.

Potential Cause: The reference formulation or path expression in the mapping is malformed.
Potential Solution: Correct the reference formulation syntax according to the rules of the chosen reference formulation.
Potential Confusion: Should not be confused with Reference Formulation Execution Error, which arises when executing a syntactically valid expression.
Potential Confusion Error: Reference Formulation Execution Error ^c

Is defined by: https://w3id.org/dre/rer#

has super-classes: Mapping Error ^c, Parsing Error ^c, Reference Formulation Error ^c

Source Access Error^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#SourceAccessError

The specified rml:Source cannot be accessed/reached/does not exist.

Potential Cause: Error in the access path or credentials
Potential Solution: Verify the source URI, network connectivity, and authentication credentials; update the mapping or environment configuration accordingly.
Potential Confusion: Do not confuse with Logical Source Error, which concerns iterating over the source rather than reaching it.
Potential Confusion Error: Logical Source Error ^c

Is defined by: https://w3id.org/dre/rer#

has super-classes: Execution Error ^c

Statement part descriptor^c back to ToC or Class ToC

IRI: https://w3id.org/dre/ptr#StatementPartDescriptor

Named descriptor of a statement position (subject, predicate, object).

Is defined by: https://w3id.org/dre/ptr#

has super-classes: Named Individual ^c
is in range of: part ^op
has members: Object ⁿⁱ, Predicate ⁿⁱ, Subject ⁿⁱ

Term Type^c back to ToC or Class ToC

IRI: http://w3id.org/rml#TermType

is in range of: allowed term types ^op

Triples Map^c back to ToC or Class ToC

IRI: http://w3id.org/rml#TriplesMap

is in range of: triples map ^op

Type Conversion Error^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#TypeConversionError

The type of a data could not be converted to the target type.

Potential Cause: An ExpressionMap generates a value of a type that is not convertible to the expected/specified type.
Potential Solution: Adjust the mapping to generate values in the expected datatype or update the target type to match the actual data.
Potential Confusion: Do not confuse with Function Execution Error, where the function fails even if the types are correct.
Potential Confusion Error: Function Execution Error ^c
Suggested Context: Data ^dp

Is defined by: https://w3id.org/dre/rer#

has super-classes: Data Error ^c, Datatype Expectation Error ^c

Unexpected Error^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#UnexpectedError

A generic internal engine error, typically indicating a bug or unexpected failure not attributable to user input.

Potential Cause: Unhandled exception, logic bug, or inconsistent internal state within the RML processor.
Potential Solution: Collect logs and stack traces, report the issue to the engine maintainers, and update to a fixed version when available.
Potential Confusion: Do not confuse with Configuration Error or Mapping Error, which are caused by user-provided configuration or mapping definitions.

Is defined by: https://w3id.org/dre/rer#

has super-classes: Error ^c

Unparseable Data Error^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#UnparseableDataError

The obtained data does not follow the expected format.

Potential Cause: The source value uses an unexpected syntax or format that cannot be parsed.
Potential Solution: Normalize the input format or adjust the reference formulation and parsing rules to accept the observed format.
Potential Confusion: May be confused with Type Conversion Error; here the problem is parsing, not converting a parsed value.
Potential Confusion Error: Type Conversion Error ^c

Is defined by: https://w3id.org/dre/rer#

has super-classes: Data Error ^c, Parsing Error ^c

Unsupported Function^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#UnsupportedFunction

The mapping references a function that the processor cannot execute because the implementation logic is missing.

Potential Cause: The function IRI exists in the mapping, but the engine has no registered code associated with that IRI.
Potential Solution: Register the custom function implementation with the engine or ensure the necessary function libraries are loaded.
Potential Confusion: Distinguished from Function Execution Error: Here the function code is never called because it wasn't found. In execution errors, the code runs but fails.
Potential Confusion Error: Function Execution Error ^c

Is defined by: https://w3id.org/dre/rer#

has super-classes: Unsupported Mapping ^c

Unsupported Mapping^c back to ToC or Class ToC

IRI: https://w3id.org/dre/rer#UnsupportedMapping

The processor encounters a feature, configuration, or term that it cannot execute. The processor implies no judgment on the validity of the construct, only its own inability to process it.

Potential Cause: The mapping uses a feature that is not implemented in this specific engine.
Potential Solution: Check the engine documentation for supported features. You may need to simplify the mapping, switch to a compatible engine, or implement the missing feature plugin.
Potential Confusion: The difference with Out Of Spec is that the engine don't know if this is spec compliant or not, whereas an Out Of Spec mapping is invalid everywhere.
Potential Confusion Error: Out Of Spec ^c

Is defined by: https://w3id.org/dre/rer#

has super-classes: Mapping Error ^c
has sub-classes: Unsupported Function ^c

Object Properties

allowed term types
Data Type
end
Expected Data Type
generated statements per target
generated statements per Triples Map
has error
has log
has source data
mapping node
mapping statement
part
plan node
reference formulation
start
statement
target
text range
triples map

allowed term types^op back to ToC or Object Property ToC

IRI: https://w3id.org/dre/rer#allowedTermTypes

has domain: Incorrect Term Type ^c
has range: Term Type ^c
is also defined as: data property

Data Type^op back to ToC or Object Property ToC

IRI: https://w3id.org/dre/rer#dataType

has domain: Data Error ^c
has range: Datatype ^c
is also defined as: data property

end^op back to ToC or Object Property ToC

IRI: https://w3id.org/dre/ptr#end

Ending point of the text range.

Is defined by: https://w3id.org/dre/ptr#

has domain: Range ^c
has range: Point ^c

Expected Data Type^op back to ToC or Object Property ToC

IRI: https://w3id.org/dre/rer#expectedDataType

has domain: Datatype Expectation Error ^c
has range: Datatype ^c
is also defined as: data property

generated statements per target^op back to ToC or Object Property ToC

IRI: https://w3id.org/dre/rer#generatedStatementsPerTarget

Number of generated statements grouped by target (rml:LogicalTarget).

Is defined by: https://w3id.org/dre/rer#

has domain: RML Execution Report ^c
has range: Generated Statements Per Target ^c

generated statements per Triples Map^op back to ToC or Object Property ToC

IRI: https://w3id.org/dre/rer#generatedStatementsPerTriplesMap

Number of generated statements grouped by triples map (rml:TriplesMap), all triples map understood by the processor needs to be present. The sum of those is not necessarily equal to rer:generatedStatements as some RML modules may imply or define behaviours after a triples has been generated.

Is defined by: https://w3id.org/dre/rer#

has domain: RML Execution Report ^c
has range: Generated Statement Per Triples Map ^c

has error^op back to ToC or Object Property ToC

IRI: https://w3id.org/dre/rer#hasError

Indicates an error that occurred.

Is defined by: https://w3id.org/dre/rer#

has super-properties: has log ^op
has domain: RML Execution Report ^c
has range: Error ^c

has log^op back to ToC or Object Property ToC

IRI: https://w3id.org/dre/rer#hasLog

Indicates a log message.

Is defined by: https://w3id.org/dre/rer#

has sub-properties: has error ^op
has domain: RML Execution Report ^c
has range: Log ^c

has source data^op back to ToC or Object Property ToC

IRI: https://w3id.org/dre/rer#hasSourceData

has domain: Error ^c
is also defined as: data property

mapping node^op back to ToC or Object Property ToC

IRI: https://w3id.org/dre/rer#mappingNode

RDF node in the mapping that is at the source of the issue. Prefer using the more precise rer:mappingStatement when possible.

Is defined by: https://w3id.org/dre/rer#

Is deprecated: true

has domain: Error ^c
has range: Resource ^c

mapping statement^op back to ToC or Object Property ToC

IRI: https://w3id.org/dre/rer#mappingStatement

RDF statement(s) in the mapping that are at the source of the issue. As soon as a mapping document is available as RDF Graph, statements parts should be used to pinpoint problematic constructs.

Is defined by: https://w3id.org/dre/rer#

has domain: Log ^c
has range: Statement part ^c

part^op back to ToC or Object Property ToC

IRI: https://w3id.org/dre/ptr#part

Whether the subject, predicate, or object of the statement is implicated.

Is defined by: https://w3id.org/dre/ptr#

has domain: Statement part ^c
has range: Statement part descriptor ^c

plan node^op back to ToC or Object Property ToC

IRI: https://w3id.org/dre/rer#planNode

RML Processor plan node at the source of the issue. Processor specific.

Is defined by: https://w3id.org/dre/rer#

Term status: experimental

has domain: Error ^c

reference formulation^op back to ToC or Object Property ToC

IRI: https://w3id.org/dre/rer#referenceFormulation

has domain: Reference Formulation Error ^c
has range: Reference Formulation ^c
is also defined as: data property

start^op back to ToC or Object Property ToC

IRI: https://w3id.org/dre/ptr#start

Starting point of the text range.

Is defined by: https://w3id.org/dre/ptr#

has domain: Range ^c
has range: Point ^c

statement^op back to ToC or Object Property ToC

IRI: https://w3id.org/dre/ptr#statement

The RDF statement to which this part belongs.

Is defined by: https://w3id.org/dre/ptr#

has domain: Statement part ^c
has range: Statement ^c

target^op back to ToC or Object Property ToC

IRI: https://w3id.org/dre/rer#target

The Logical Target for which the statistics are reported.

Is defined by: https://w3id.org/dre/rer#

has domain: Generated Statements Per Target ^c
has range: Logical Target ^c

text range^op back to ToC or Object Property ToC

IRI: https://w3id.org/dre/ptr#textRange

Character range in the mapping text where the error occurs.

Is defined by: https://w3id.org/dre/ptr#

has domain: Statement part ^c
has range: Range ^c

triples map^op back to ToC or Object Property ToC

IRI: https://w3id.org/dre/rer#triplesMap

The Triples Map for which the statistics are reported.

Is defined by: https://w3id.org/dre/rer#

has domain: Generated Statement Per Triples Map ^c
has range: Triples Map ^c

Data Properties

column
Data
generated statements
has source data
is complete
is success
iteration data
iteration index
language tag
line
message
number of triples map
order
processor name
processor version
reference
stack trace
Timestamp of the log message.

column^dp back to ToC or Data Property ToC

IRI: https://w3id.org/dre/ptr#column

Column number for the point.

Is defined by: https://w3id.org/dre/ptr#

has domain: Point ^c
has range: integer

Data^dp back to ToC or Data Property ToC

IRI: https://w3id.org/dre/rer#data

Raw data value that violates expectations.

Is defined by: https://w3id.org/dre/rer#

has sub-properties: language tag ^dp
has domain: Data Error ^c
has range: Literal

generated statements^dp back to ToC or Data Property ToC

IRI: https://w3id.org/dre/rer#generatedStatements

Number of statements produced by the execution of the mapping at a specific scope (total, per Triples Map, per target).

Is defined by: https://w3id.org/dre/rer#

has domain: Generated Statement Per Triples Map ^c or Generated Statements Per Target ^c or RML Execution Report ^c
has range: integer

has source data^op back to ToC or Data Property ToC

IRI: https://w3id.org/dre/rer#hasSourceData

has range: Literal
is also defined as: object property

is complete^dp back to ToC or Data Property ToC

IRI: https://w3id.org/dre/rer#isComplete

Are the output datasets complete.

Is defined by: https://w3id.org/dre/rer#

has domain: RML Execution Report ^c
has range: boolean

is success^dp back to ToC or Data Property ToC

IRI: https://w3id.org/dre/rer#isSuccess

Indicates if the execution completed successfully without critical failure. Typically corresponds to exit code 0.

Is defined by: https://w3id.org/dre/rer#

has domain: RML Execution Report ^c
has range: boolean

iteration data^dp back to ToC or Data Property ToC

IRI: https://w3id.org/dre/rer#iterationData

Serialized data item for the iteration that generated the log message.

Is defined by: https://w3id.org/dre/rer#

has domain: Log ^c
has range: Literal

iteration index^dp back to ToC or Data Property ToC

IRI: https://w3id.org/dre/rer#iterationIndex

The index of the iteration that generated the log message.

Is defined by: https://w3id.org/dre/rer#

has domain: Log ^c
has range: integer

language tag^dp back to ToC or Data Property ToC

IRI: https://w3id.org/dre/rer#languageTag

Language tag attached to the offending literal.

Is defined by: https://w3id.org/dre/rer#

has super-properties: Data ^dp
has domain: Invalid Language Tag Error ^c
has range: language

line^dp back to ToC or Data Property ToC

IRI: https://w3id.org/dre/ptr#line

Line number for the point.

Is defined by: https://w3id.org/dre/ptr#

has domain: Point ^c
has range: integer

message^dp back to ToC or Data Property ToC

IRI: https://w3id.org/dre/rer#message

Human-readable message associated with an error or a warning.

Is defined by: https://w3id.org/dre/rer#

has domain: Log ^c
has range: Literal

number of triples map^dp back to ToC or Data Property ToC

IRI: https://w3id.org/dre/rer#numberOfTriplesMap

Indicate how many Triples Map were found in the RML mapping document.

Is defined by: https://w3id.org/dre/rer#

has domain: RML Execution Report ^c
has range: integer

order^dp back to ToC or Data Property ToC

IRI: https://w3id.org/dre/rer#order

An optional implementation defined order for log messages.

Is defined by: https://w3id.org/dre/rer#

has domain: Log ^c

processor name^dp back to ToC or Data Property ToC

IRI: https://w3id.org/dre/rer#processorName

The name of the RML processor that generated this report.

Is defined by: https://w3id.org/dre/rer#

has domain: RML Execution Report ^c
has range: string

processor version^dp back to ToC or Data Property ToC

IRI: https://w3id.org/dre/rer#processorVersion

The version of the RML processor that generated this report.

Is defined by: https://w3id.org/dre/rer#

has domain: RML Execution Report ^c
has range: string

reference^dp back to ToC or Data Property ToC

IRI: https://w3id.org/dre/rer#reference

The reference formulation expression that generated the log message.

Is defined by: https://w3id.org/dre/rer#

has domain: Reference Formulation Error ^c
has range: string

stack trace^dp back to ToC or Data Property ToC

IRI: https://w3id.org/dre/rer#stackTrace

The stack trace of the error that generated the log message.

Is defined by: https://w3id.org/dre/rer#

has domain: Log ^c
has range: string

Timestamp of the log message.^dp back to ToC or Data Property ToC

IRI: https://w3id.org/dre/rer#timestamp

Time at which the log entry was produced.

Is defined by: https://w3id.org/dre/rer#

has domain: Log ^c
has range: date Time Stamp

Objectⁿⁱ back to ToC or Named Individual ToC

IRI: https://w3id.org/dre/ptr#Object

Is defined by: https://w3id.org/dre/ptr#

belongs to: Statement part descriptor ^c

Predicateⁿⁱ back to ToC or Named Individual ToC

IRI: https://w3id.org/dre/ptr#Predicate

Is defined by: https://w3id.org/dre/ptr#

belongs to: Statement part descriptor ^c

Subjectⁿⁱ back to ToC or Named Individual ToC

IRI: https://w3id.org/dre/ptr#Subject

Is defined by: https://w3id.org/dre/ptr#

belongs to: Statement part descriptor ^c

Legend back to ToC

^c: Classes
^op: Object Properties
^dp: Data Properties
ⁿⁱ: Named Individuals

RML Execution Report (RER) Vocabulary

Abstract