Re: [TM4J-users] Problem to create a new topic using the name of a deleted topic

[Dicheva, D. <dic...@ws...>]

Lars - thank you so much!! This is so helpful.

All the very best,
Darina 

> -----Original Message-----
> From: Lars Heuer [mailto:he...@se...] 
> Sent: Wednesday, June 11, 2008 11:10 AM
> To: Dicheva, Darina
> Cc: tm4...@li...; Lars Johnsen; 
> tm4...@li...
> Subject: Re: Problem to create a new topic using the name of 
> a deleted topic
> 
> Hi Darina,
> 
> > Thanks for your idea - it seems good; what do you mean by item 
> > identifiers/source locators - subjectIdentifier? subjectLocator?
> 
> I meant "source locators" which have been renamed into "item 
> identifiers" in the TMDM.
> 
> The "TopicMapObject" base class has the methods 
> "addSourceLocator(Locator)", "removeSourceLocator(Locator)" 
> and "getSourceLocators()".
> 
> I assume that your code (with topic name merging enabled) looks like
> this:
> 
> Fragment A:
> 
>      Topic topicA = tm.createTopic();
>      TopicName nameA = topic.createTopicName("Foo", null);
>      // Here some occurrences, assocs etc.
> 
> 
> Fragment B:
> 
>     Topic topicB = tm.createTopic();
>     TopicName nameB = topic.createTopicName("Foo", null);
> 
> 
> Result: The topics "topicA" and "topicB" are merged since 
> they have the same name "Foo".
> 
> 
> The equivalent code using my solution would look like this 
> (topic name merging NOT enabled!):
> 
> Fragment A:
>      Topic topicA = tm.createTopic();
>      Locator iidA = tm.createLocator("http://www.example.org/#" +
>      "Foo");
>      topicA.addSourceLocator(iidA);
>      TopicName nameA = topic.createTopicName("Foo", null);
>      // Here some occurrences, assocs etc.
> 
> 
> Fragment B:
>     Topic topicB = tm.createTopic();
>     Locator iidB = tm.createLocator("http://www.example.org/#" +
>      "Foo");
>     topicB.addSourceLocator(iidB);
> 
> Result: The topics "topicA" and "topicB" are merged because 
> they have the same source locator (<http://www.example.org/#Foo>).
> 
> Maybe you have to catch the "TopicMustMergeException" if you 
> add the source locator to the topics, that depends on your "automerge"
> setting. If "automerge" is not enabled, you can catch that 
> exception and merge the topics manually via Topic#mergeIn(Topic).
> 
> > In other orders, how the merge algorithm works in case merge by 
> > topicName is false?
> 
> Merging is done, if two topic have:
> * at least one equal locator in their [subject identifiers] 
> properties,
> * at least one equal locator in their [source locators] properties,
> * at least one equal locator in their [subject locators] properties,
> 
> See also: <http://www.isotopicmaps.org/sam/sam-model/#d0e739>
> 
> (In TM4J, the [subject locators] property does not exists, 
> since it can handle max. one subject locator (XTM 1.0 legacy)).
> 
> Best regards,
> Lars
> --
> Semagia
> <http://www.semagia.com>
> 
> 
>