[XESAM] Ontology sketch. Feedback needed. This time with attachment.

[Leo Sauermann]

It was Evgeny Egorochkin who said at the right time 01.06.2007 11:31 the 
following words:
> On Friday 01 June 2007 11:16:55 Leo Sauermann wrote:
>   
>> It was Evgeny Egorochkin who said at the right time 31.05.2007 16:40 the
>>
>> following words:
>>     
>>> On Thursday 31 May 2007 17:27:46 jamie wrote:
>>>       
>>>> On Thu, 2007-05-31 at 14:50 +0300, Evgeny Egorochkin wrote:
>>>>         
>>>>> On Thursday 31 May 2007 12:50:24 Antoni Mylka wrote:
>>>>>
>>>>> 3) RDF object is always literal. Can't directly reference
>>>>> resources.(has workarounds).
>>>>>           
>>>> what are the workarounds?
>>>>         
>>> The workaround is to specify an URI as a literal and hope software
>>> understands this in cases like linking archive contents.
>>>       
>> I miss the whole discussion, but RDF objects in statements are either
>> literal, blank nodes, or URIs.
>> like this (turtle syntax):
>> <file://home/dirk/blub.txt> nie:myExampleUri <http://exampleuri>.
>> <file://home/dirk/blub.txt> nie:myExampleString "Unterzögersdorf".
>>     
>
> Yes, but xesam decided to limit objects to literals only(as well as other 
> limitations) and lift them only if it is necessary.
>
> That is xesam is fully RDFS-compliant, yet we implement the smallest necessary 
> subset of it for performance, coding complexity and other considerations.
>   

you need datatypes for String, boolean, DateTime and Float anyway, 
adding URL won't hurt much.



btw, to throw them in here, perhaps somebody needs them
here are the links to the relevant other standards, I am currently 
writing a document for something else and gathered them. They use  
string, boolean, datatime, float.

 http://developer.apple.com/documentation/Carbon/Conceptual/MDImporters/Concepts/WritingAnImp.html 
the typical example of implementing a spotlight extension is writing a 
file importer.

[1] 
http://developer.apple.com/documentation/Carbon/Reference/MetadataAttributesRef/index.html 
Possible standard values for indexed documents in spotlight.

[1] http://desktop.google.com/dev/indexapi.html#eventschemas The 
metadata schemas for google desktop. Similar ideas as the OS vendors 
formats.

[1] http://msdn2.microsoft.com/en-us/library/ms692560.aspx Basic 
examples of Microsoft Indexing Service’s properties.


best
Leo

-- 
____________________________________________________
DI Leo Sauermann       http://www.dfki.de/~sauermann 

Deutsches Forschungszentrum fuer 
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Geschaeftsfuehrung:
Prof.Dr.Dr.h.c.mult. Wolfgang Wahlster (Vorsitzender)
Dr. Walter Olthoff
Vorsitzender des Aufsichtsrats:
Prof. Dr. h.c. Hans A. Aukes
Amtsgericht Kaiserslautern, HRB 2313
____________________________________________________

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