Mappings need rr:TriplesMap to transform [R2]RML into YARRRML

[Diego Conde]

Describe the bug
When attempting to transform the mappings from the "Base topológica nacional BTN100" dataset from RML into YARRRML formt the file is created but the mappings section is empty.

To Reproduce

1. Execute the command "python3 -m yatter -i btn100mappings.ttl -o btn_yarrrml.yml" as stated in the tutorial present in the repository.

Input Data
btn100mappings.zip

Screenshot of the output.

[David Chaves]

This is not a bug... the mapping is in R2RML, not RML, so needs to indicate the input format:
python3 -m yatter -i btn100mappings.ttl -o btn_yarrrml.yml -f R2RML
mapping.yml.txt

[David Chaves]

This has been solved!