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Date: Wed, 8 Feb 2017 14:44:41 +0000 (UTC)
From: "ASF GitHub Bot (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (COMMONSRDF-51) RDF-1.1 specifies that language
 tags need to be compared using lower-case
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archived-at: Wed, 08 Feb 2017 14:44:54 -0000


    [ https://issues.apache.org/jira/browse/COMMONSRDF-51?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15858077#comment-15858077 ] 

ASF GitHub Bot commented on COMMONSRDF-51:
------------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/commons-rdf/pull/30


> 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
>            Assignee: Stian Soiland-Reyes
>
> The [RDF-1.1 specification states that the [value space of Literal language tags is lowercase|https://www.w3.org/TR/rdf11-concepts/#section-Graph-Literal], 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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