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Posted to issues@commons.apache.org by "Stian Soiland-Reyes (JIRA)" <ji...@apache.org> on 2017/02/08 14:46:41 UTC
[jira] [Resolved] (COMMONSRDF-51) RDF-1.1 specifies that language
tags need to be compared using lower-case
[ https://issues.apache.org/jira/browse/COMMONSRDF-51?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Stian Soiland-Reyes resolved COMMONSRDF-51.
-------------------------------------------
Resolution: Fixed
Fixed from pull request #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
> Fix For: 1.0.0
>
>
> 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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