Peter Ansell created COMMONSRDF-51:
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Summary: RDF-1.1 specifies that language tags need to be compared
using lower-case
Key: COMMONSRDF-51
URL: https://issues.apache.org/jira/browse/COMMONSRDF-51
Project: Apache Commons RDF
Issue Type: Bug
Components: api
Affects Versions: 0.3.0
Reporter: Peter Ansell
The RDF-1.1 specification states that the value space of Literal language tags
is lowercase, which does not conflict with the case-insensitive specification
in BCP47. The Literal.equals and Literal.hashCode API contracts should specify
that language tags must be compared using lowercase, even if they are otherwise
stored and returned as upper-case by getLanguageTag. The API currently has
incorrect language by saying "character-by-character" for language tag
comparisons, as that implies case-sensitive comparisons are used.
The lowercasing must also be done using a locale that is consistent (known
example where lowercase and uppercase do not roundtrip as expected for US-ASCII
characters is Turkish [1]), so I would recommend actually stating that
.toLowerCase(Locale.ENGLISH) is used.
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