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RMLio / rmlmapper-java

The RMLMapper executes RML rules to generate high quality Linked Data from multiple originally (semi-)structured data sources
http://rml.io
MIT License
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Error when there is no rr:TriplesMap #98

Closed ktk closed 3 years ago

ktk commented 3 years ago

When there is no rr:TriplesMap defined in the mapping file I get an error like this:

22:41:14.251 [main] ERROR be.ugent.rml.cli.Main               .main(193) - Failed to make mapping file conformant to RML spec.
java.lang.Exception: Mapping requires at least one TriplesMap
        at be.ugent.rml.conformer.MappingConformer.detect(MappingConformer.java:80)
        at be.ugent.rml.conformer.MappingConformer.conform(MappingConformer.java:55)
        at be.ugent.rml.cli.Main.main(Main.java:187)
        at be.ugent.rml.cli.Main.main(Main.java:36)

But the XML example in the spec do not provide one either. So who is correct, spec or implementation?

thomas-delva commented 3 years ago

Hi and thanks for using RML,

Indeed, this (non-fatal) error does not align perfectly with the examples in the spec. However, for the spec's examples the implementation can infer what the triples maps are (namely: the subjects of rml:logicalSource) and the output is as intended even without explicitly using stating a rr:TriplesMap.

We are adding a rr:TriplesMap statements to the examples in the spec to make it more clear for everyone.

DylanVanAssche commented 3 years ago

This is now fixed on https://rml.io/spec. Let us know if you still have issues.

no-response[bot] commented 3 years ago

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