Illegal language tags (in RDF/XML) can cause exceptions in Fuseki+TDB.

(split from JENA-163)

Alexander Dutton writes:

It seems to be the following language tags in the data that cause this issue:

• i18n
• sr@latin

Both have invalid syntax as per BCP 47, but it might be worth catching this a little earlier and throwing a more appropriate error:

[alex@lucy jena-fuseki-0.2.4]$ curl -XPUT "http://localhost:3030/public/data?graph=http://creativecommons.org/publicdomain/zero/1.0/rdf" -d@rdf -H"Content-type: application/rdf+xml" -i
HTTP/1.1 100 Continue

HTTP/1.1 500 Different ids for http://xmlns.com/foaf/0.1/logo: allocated: expected [000000000000041D], got [000000000000041A]
Access-Control-Allow-Origin: *
Server: Fuseki (0.2.4)
Content-Length: 0