- intern identifiers?
- <jeremiah>	is there a way to text-search over literals yet?

- finish n3 serializers
- n3 parsers; finish ntriples parser

- fast-ugly xml serializer (profile, remove nesting)
- heuristic between fast-xml and slow-xml, the "xml" default
- add a "fast-xml" and "pretty-xml" separate serialize options

- write some docs for these new interfaces

- load_and_convert(src, from, to) service

