On 22 March 2013 23:21, Andrea Di Menna <ninn...@gmail.com> wrote:
>
> Hi Jona,
>
> thanks for merging the pull request!
>
> Anyway, couldn't we use percent encoding for Unicode code points which are
> not allowed in N-Triples? (namely those outside the [#x20,#7E] range?
> In this case we should get UTF-8 bytes and percent encode them.
>
> For example, as far as I can see
>
> Marl$00C3$00ADn$002C_$00C3$0081vila
>
> is
>
> <http://dbpedia.org/resource/Marl%C3%83%C2%ADn,_%C3%83%C2%81vila>
>
> where \00C3 is 0xC3 0x83
>          \00AD is 0xC2 0xAD
>          \0081 is 0xC2 0x81

Oh, by the way, it would be
http://dbpedia.org/resource/Marl%C3%ADn,_%C3%81vila because that's the
UTF-8-percent-encoding for Marlín,_Ávila.

The weird thing is that these Wikipedia page titles in the Freebase
contain UTF-8-encoded characters when they should contain no encoding
at all, just plain Unicode code points. (Of course, the characters and
codepoints are also dollar-escaped as usual for Freebase, but that's
not a problem.)


JC

>
> WDYT?
>
> Cheers
> Andrea
>
> 2013/3/22 Christopher Sahnwaldt <notificati...@github.com>
>>
>> Ok, I got it. It has nothing to do with your platform. These are actually
>> wrong URIs. There's not much we can do about it. I don't know where Freebase
>> got them from, but I assume they may actually be wrong in Wikipedia.
>>
>> Examples:
>>
>> Marl$00C3$00ADn$002C_$00C3$0081vila
>> AD 2C and C3 81 are UTF-8 encodings, but Freebase says [1] that the
>> numbers should be plain Unicode code points, not UTF-8 bytes. 81 is an
>> invalid code point, so we generate an invalid URI.
>>
>> Bene$009A_decrees
>> 9A is the Windows-1252 encoding for š, but 9A invalid in Unicode.
>>
>> Switzerland$2003
>> 2003, 2029 etc. are valid Unicode code points, but for whitespace
>> characters that are invalid in URIs
>>
>> In a nutshell: all these characters are invalid in URIs, and it's not our
>> fault. I'll pull your changes in a moment.
>>
>> [1] http://wiki.freebase.com/wiki/MQL_key_escaping
>>
>> —
>> Reply to this email directly or view it on GitHub.
>
>

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