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https://issues.apache.org/jira/browse/COMMONSRDF-51?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15691900#comment-15691900
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Gary Gregory commented on COMMONSRDF-51:
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I use Locale.ROOT for convertions to avoid the Turkish issue. Please see
https://garygregory.wordpress.com/2015/11/03/java-lowercase-conversion-turkey/
> 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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