Off-the-shelf database support for CoNLL TSV is currently limited to dialects with constant number of columns.
while, after conversion from CoNLL TSV, dependency labels are stored as literal values of conll:EDGE, it is easy to transform them into object properties using a simple SPARQL Update statement: As the example also illustrates, RDF resources can be defined in a way that their IRIs/URIs resolve against external resources, e.g., the dependency label nsubj yields the URL http://universaldependencies.org/ u/dep/nsubj and thus a human-readable definition.