- Write as NS:ID, compatible with what can be handed to the rdf predicates. This is the default.
- Use quoted write of the full resource.
- Write namespace followed by the label. This format cannot be handed to rdf/3 and friends, but can be useful if resource-names are meaningless identifiers.
- This combines prefix:id with prefix:label, providing both human readable output and output that can be pasted into the commandline.