RML Reference implementation does not like XRM Turtle output

[ktk]

It looks like the RML reference implementation RML Mapper is using a stricter Turtle parser than pretty much anything I tested so it will not run the mapping. When I convert it, it works.

I tried figuring out what it is but couldn't find a version that worked. Not sure how to proceed.

[mchlrch]

We don't explicitly validate the generated turtle. I think that so far people have used the generated mappings with processors that have tolerant parsers and therefore no issues.

Here are a few places were the generated turtle is lax and might cause validation issues:

<#AirportMapping>
	rml:logicalSource [
		rml:source "http://www.example.com/Airport.csv" ;
		rml:referenceFormulation ql:CSV      <<==
	];
	
	rr:subjectMap [
		rr:template "http://airport.example.com/{id}" ;
		rr:class transit:Stop ;      <<==
	];
	
	rr:predicateObjectMap [
		rr:predicate transit:route ;
		rr:objectMap [
			rml:reference "stop" ;
			rr:datatype xsd:integer ;      <<==
		];      <<==
	];

[mchlrch]

With XRM version 1.2.0, the generated turtle files now have stricter syntax compliance.