[topicmapmail] reification and other funny things

[Joril Andersen]

Hi Lars *2,

Thank you for quick and good answers!
I got all the answers I needed. Yes, I am not surprised you did not manage 
to follow my chain of thoughts: ) -->I was wrong, and I have now seen the 
light! I sort of mixed up the occurrence with the information resource, as 
you pointed out Lars M.

I may have more questons tomorrow;) Have a nice evening!

Joril


Joril Andersen
Helgesens gate 3
0553 Oslo
Mobil: 95256088




>From: Lars Marius Garshol <larsga at garshol.priv.no>
>To: topicmapmail at infoloom.com
>Subject: Re: [topicmapmail] reification and other funny things
>Date: Thu, 26 Oct 2006 15:14:22 +0200
>
>
>* Joril Andersen
>>
>>....the data model 2.0 says that a topic has null or one  information item 
>>in its reified property.
>>
>>In the TMAPI the topic.getReified() method returns a set of topic  map 
>>constructs that this topic reifies.
>>Which is correct?
>
>The TMDM is correct. TMAPI has this wrong. A topic can't reify more  than 
>one thing, as this would violate the "one subject per topic"-rule.
>
>>If a topic reifies an occurrence, I would think that this  occurrence can 
>>be assigned to several topics.
>
>There are different ways I could interpret what you say here. Do you  mean 
>that multiple topics can reify the occurrence (this is not the  case; they 
>must in that case merge), or that the occurrence can be an  occurrence of 
>multiple topics (also incorrect, per TMDM), or  something else?
>
>>And hence the reified topic would contain a set with alle these  
>>occurrence items in the different topics?
>
>Now I'm lost. Above you were only talking about a single occurrence  item, 
>but now there are suddenly more of them. Which occurrence items  do you 
>mean?
>
>>A document on well-known composers could be attached to both Puccini 
>>(topic) and Verdi(topic)? Or should an occurrence be more  specificly 
>>related to a topic?
>
>There is a difference between the document and the occurrences. The  
>document is an information resource, but the occurrences are the  
>relationships between various topics and the information resource. In  
>other words, you can have (using LTM):
>
>   {puccini, article-about, "http://example.com/italian-composers/"}
>   {verdi, article-about, "http://example.com/italian-composers/"}
>
>but this is two occurrences, not one, even if there is just one web  page 
>involved. So if you created a topic to reify the first  occurrence that 
>topic would not (and could not) reify the second.
>
>>During deserialization, wouldn't the list of reified properties be  
>>created for each topic?
>
>Here I'm lost again, I'm afraid. What do you mean?
>
>--Lars M.
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