On 09.04.19 09:19, Glenn Eriksson wrote: > I've been reading about the R2RML Ontop API for Java. But to my > limited knowledge it seams geared towards queering and transforming > relational DB (JDBC) to RFD and not trough merging tabular data with > RDF model.
Most R2RML implementations work fine with CSV as well but you can also use RML. We have an XText based DSL for R2RML/RML so writing the mapping files is far less work. It's available on Github, using Eclipse DSL. But it's not much documented yet so you might have to play around with it. https://github.com/mchlrch/experimental-rmdsl I use this for really large mappings and it works flawlessly. Other Java based options: https://tarql.github.io/ https://github.com/carml/carml carml is RML, but a much faster implementation than the reference implementation of RML. another Java R2RML implementation which I did not try myself: https://github.com/nkons/r2rml-parser But out of curiosity, you want GTFS in RDF or you want to know what it means to get there? Because I personally really try to avoid writing stuff other people already solved unless I have a good reason to do so :) regards Adrian
