why does the addDomain method affect the domain's SuperClass?

Mon, 08 Sep 2014 23:42:08 -0700 

I'm creating an ontology from excel files and I have some problems to make
my program work.

The first problem I encounter is that I can't get the right superclass .The
simplest code example is below.

Code begin:

OntModel individuals = ModelFactory.createOntologyModel();

      TreeMap<String, String> namespaces=new TreeMap<String,String>();

      namespaces.put("pubo",
"http://www.xxx.org.cn/standards/publishing/ontology/cores/";);

      individuals.setNsPrefixes(namespaces);

      OntClass
class1=individuals.createClass(namespaces.get("pubo")+"class1");

      class1.setLabel("class1", "en");

      OntClass
class2=individuals.createClass(namespaces.get("pubo")+"class2");

      class2.setLabel("class2", "en");

class2.setSuperClass(class1);

      System.out.println(class2.getSuperClass().getURI());

      DatatypeProperty p = individuals.createDatatypeProperty(namespaces

            .get("pubo") + "haha");

      p.addDomain(class2);

      System.out.println(class2.getSuperClass().getURI());

Code end

The first output is:
<http://www.xxx.org.cn/standards/publishing/ontology/cores/class1>
http://www.xxx.org.cn/standards/publishing/ontology/cores/class1

The second output is : http://www.w3.org/2000/01/rdf-schema#Resource

I have no idea why the two output are different? Have I done something
wrong? Any suggestions?

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