Jena doesn't accept the urn:uuid: UUID prefix

[mielliott]

Apache Jena doesn't seem to like the urn:uuid: prefixes on UUIDs. Trying to build an index from a list of nquads gave the following error:

$ preston cat --remote http://preston.acis.ufl.edu hash://sha256/8ff46ae6a30bf9647df0294b92434a83784626b3f8c37163db3edefb049daead | tee progress.log | preston grep --no-cache --remote http://preston.acis.ufl.edu 'http://www.botanicalcollections.be/specimen/[a-zA-Z]+[0-9]+V?' | bzip2 > grep-out.nq.bz2
$ tdbloader --loc index/ grep-out.nq.bz2 
13:01:13 INFO  loader          :: -- Start triples data phase
13:01:13 INFO  loader          :: ** Load empty triples table
13:01:13 INFO  loader          :: -- Start quads data phase
13:01:13 INFO  loader          :: ** Load empty quads table
13:01:13 INFO  loader          :: Load: grep-out.nq.bz2 -- 2021/05/21 13:01:13 EDT
13:01:13 ERROR riot            :: [line: 1, col: 1 ] Bad IRI: Not a valid UUID string: urn:uuid:d1ddb004-ff12-491d-9a93-3282a6aba454
org.apache.jena.riot.RiotException: [line: 1, col: 1 ] Bad IRI: Not a valid UUID string: urn:uuid:d1ddb004-ff12-491d-9a93-3282a6aba454

Looks like Jena complained about the first UUID it encountered:

$ bzcat grep-out.nq.bz2 | grep -n "d1ddb004-ff12-491d-9a93-3282a6aba454"
1:<d1ddb004-ff12-491d-9a93-3282a6aba454> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Activity> <d1ddb004-ff12-491d-9a93-3282a6aba454> .
2:<d1ddb004-ff12-491d-9a93-3282a6aba454> <http://www.w3.org/ns/prov#wasInformedBy> <a1e86586-c7c4-4f90-b066-4c9a53bf6c7a> <d1ddb004-ff12-491d-9a93-3282a6aba454> .
3:<d1ddb004-ff12-491d-9a93-3282a6aba454> <http://www.w3.org/ns/prov#used> <hash://sha256/030e42b29d292e98ed25f081adf789e28b085a4cfd667fff4d3a34fc554a3030> <d1ddb004-ff12-491d-9a93-3282a6aba454> .
4:<d1ddb004-ff12-491d-9a93-3282a6aba454> <http://purl.org/dc/terms/description> "An activity that finds the locations of text matching the regular expression 'http://www.botanicalcollections.be/specimen/[a-zA-Z]+[0-9]+V?' inside any encountered content (e.g., hash://sha256/... identifiers)."@en <d1ddb004-ff12-491d-9a93-3282a6aba454> .

After dropping the urn:uuid: prefix via sed 's/urn:uuid://g', the tdbloader command succeeded.

Tool versions:

$ tdbloader --version
Jena:       VERSION: 4.0.0
Jena:       BUILD_DATE: 2021-03-27T10:32:16+0000
ARQ:        VERSION: 4.0.0
ARQ:        BUILD_DATE: 2021-03-27T10:32:16+0000
TDB:        VERSION: 4.0.0
TDB:        BUILD_DATE: 2021-03-27T10:32:16+0000
$ preston version
0.2.5

[jhpoelen]

Jena is no longer used, and workaround exists.

Oxigraph seems to be able to handle the uuids ok.