Twirl is a SPIN constraint validator that is meant to be a drop-in replacement for the SPIN RDF.
Twirl implementation is based on plain SPARQL execution and does not depend on Jena's internals, which leads to issues in SPIN RDF:
- Behavior change between Jena 3.0.1 and 3.16.0-SNAPSHOT
- SPIN constraint validation differs on 3.0.1 and 3.16.0-SNAPSHOT
Twirl has the following limitations:
ASKconstraints are not supported (onlyCONSTRUCT)- constraint violation fixes are not supported
- SPIN functions are not supported
- SPIN rules are not supported
Note that Twirl uses a different version of the SPL vocabulary.