Github user afs commented on the issue:
https://github.com/apache/jena/pull/211
The `_:b0`, `_:b1` blank nodes from from jsonld-java.
It happens in `JsonLdApi.generateBlankNodeIdentifier`. The algorithm is
non-normative in the JSON-LD 1.0 spec.
In the JSON-LD 1.1 spec:
http://json-ld.org/spec/latest/json-ld-api/#generate-blank-node-identifier
There is an issue with blank nodes generated indirectly, not from a label
in the syntax, in case if there is an explicit label in the data of `b0` etc.
there would be a clash.
So we can arrange that the output blank node labels reflect the data but
these are lost when reading them in again.
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