Fwd: Access to DUL.owl ontology

See the email below from an SSN user as one example.



-------- Forwarded Message --------
Subject:  Access to DUL.owl ontology
Resent-Date:  Wed, 17 Aug 2016 17:23:55 +0000
Resent-From:  public-xg-ssn@w3.org
Date:  Thu, 18 Aug 2016 01:22:43 +0800
From:  Sergio José Rodríguez Méndez <srodriguez@pet.cs.nctu.edu.tw>
To:  public-xg-ssn@w3.org, semantic-web@w3.org



Hello.

Currently, I'm working on an ontology definition aligned to Semantic 
Sensor Network Ontology (SSN) <http://purl.oclc.org/NET/ssnx/ssn>, 
which, in turn, is aligned to the Dolce Ultra-Lite upper ontology 
<https://www.w3.org/2005/Incubator/ssn/wiki/SSN_Skeleton#Aligning_the_SSN_Ontology_and_the_core_SSO_design_pattern_with_DOLCE>. 


One can see <https://www.w3.org/2005/Incubator/ssn/ssnx/ssn#Module_DUL> 
that in the SSN ontology spec, the DUL IRI namespace is:
*http://www.loa-cnr.it/ontologies/DUL.owl*

However, it seems that this "link is broken", due that the IRI doesn't 
point the the proper DUL.owl definition.

I'm trying to see/generate a data model visualization of SSN via the 
tool WebVOWL (Web-based Visualization of Ontologies) 
<http://vowl.visualdataweb.org/webvowl.html>.

For this, I'm following this IRI:
http://vowl.visualdataweb.org/webvowl/#iri=http://purl.oclc.org/NET/ssnx/ssn

However, it fails due that it cannot find/retrieve DUL's definition:
{
/Could not load imported ontology: 
&lt;http://www.loa-cnr.it/ontologies/DUL.owl&gt; Cause: Problem parsing 
http://www.loa-cnr.it/ontologies/DUL.owl/
/Could not parse ontology./
}

Questions:

  * Is there any standard way to handle this "broken link" when aligning
    to upper ontologies?
  * Should DUL.owl be fixed?
  * Should SSN address this situation "somehow"?
  * If I'm aligning to SSN, how I should address this situation?

Thank you for your feedback.

/$¡rm
Best regards,

Sergio José Rodríguez Méndez (羅士豪)
Pervasive Embedded Technologies Laboratory (PET Lab)
Computer Science Department
National Chiao Tung University