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  1. Apache Commons RDF
  2. COMMONSRDF-51

RDF-1.1 specifies that language tags need to be compared using lower-case

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Details

    • Bug
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • 0.3.0
    • 0.5.0
    • api
    • None

    Description

      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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              stain Stian Soiland-Reyes
              ansell Peter Ansell
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