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zazuko / xrm

A friendly language for mappings to RDF
MIT License
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Two mapping files create two R2RML mappings #136

Closed oschihin closed 3 years ago

oschihin commented 4 years ago

I wanted to split sources and mapping files, first according to "data producer" (as we have two institutions in the same data source). You can see the split and result in this commit on our mapping repo. The problem: Two files with file names mapping-stabs-ve.xrm and mapping-rie-ve.xrm create two separate R2RML mapping files. The R2RML mapping is encoded in the pipeline. I could of course change it there, too, but still would have to deal with multiple mapping files.

Wouldn't it be better to have one mapping file output in src-gen?

mchlrch commented 4 years ago

@oschihin If you only want one generated R2RML mapping file, then you can put all map elements into the same XRM file. The behavior that each XRM file containing one or more map elements yields a corresponding generated mapping file is on purpose like that. This makes it for example possible to manage an R2RML mapping for a relational source and a RML mapping for a XML source in the same project.

On the other hand, how you split up sources, vocabularies or templates into separate XRM files has no impact on the amount of generated mapping files.

oschihin commented 4 years ago

@mchlrch ok, I see the point. In my case, it would be nice to have shorter mapping files. For now, they're ok, but soon will be hard to handle. But then, there's outlines etc. And I'll need additional pipelines, all doable. Thanks, I'll close.

vhf commented 4 years ago

One idea would be to add an optional argument to https://github.com/Staatsarchiv-Basel-Stadt/StABS-scope2RDF/blob/ece6c44b9add62fa567096fb065f9ce217c89e7f/src/mapping-rie-ve.xrm#L1 output r2rml, for instance : output r2rml mymapping.r2rml.ttl, what do you think?

oschihin commented 4 years ago

Sounds like an interesting option, it would definitely help. One thought: Could template elements be used across different mapping files? This would allow to have simply a "template file".

tpluscode commented 4 years ago

Yes, templates, as well as vocabularies, can be used anywhere in the mappings. I have created such a "template file" in my mapping project: https://github.com/wikibus/migrate-sources/blob/master/mapping/templates.xrm

ktk commented 3 years ago

I don't see an open issue left in here, closing.