Instanciation of Annotation properties

Dear openAnnotation community,

I'm reusing the Web annotation ontology "oa" and I'm confused about
instanciation of annotation properties like  oa:hasBody, oa:hasTarget and
dcterms:creator.

For example, in my ontology "LearnAnnot" I want to associate  the  "annot1"
to the  "Learner1" by the property "dcterms:creator", and by using Protege
5.2, I found that I can proceed by different manners :

   - instanciate the annotation property dcterms:creator to create the
   triplet (annot1, dcterms:creator, learner1). Thus the Protege genarates the
   code :

<owl:AnnotationProperty rdf:about="http://purl.org/dc/terms/creator"/>

    <!-- http://www.univ-batna.dz/elearning/LearnAnnot#Learner -->

    <owl:Class rdf:about="http://www.univ-batna.dz/elearning/LearnAnnot#Lea
rner">
        <rdfs:subClassOf rdf:resource="http://xmlns.com/foaf/0.1/Person"/>
    </owl:Class>

    <!-- http://www.univ-batna.dz/elearning/LearnAnnot#annot1 -->

    <owl:NamedIndividual rdf:about="http://www.univ-bat
na.dz/elearning/LearnAnnot#annot1">
        <rdf:type rdf:resource="http://www.w3.org/ns/oa#Annotation"/>
        <terms:creator rdf:resource="http://www.univ-
batna.dz/elearning/LearnAnnot#learner1"/>
    </owl:NamedIndividual>

    <!-- http://www.univ-batna.dz/elearning/LearnAnnot#learner1 -->

    <owl:NamedIndividual rdf:about="http://www.univ-bat
na.dz/elearning/LearnAnnot#learner1">
        <rdf:type rdf:resource="http://www.univ-
batna.dz/elearning/LearnAnnot#Learner"/>
    </owl:NamedIndividual>

   - specify a domain and a range to dcterms:creator before its
   instanciation. In this case, Protege replace the first line in the previous
   code by :

<owl:AnnotationProperty rdf:about="http://purl.org/dc/terms/creator">
        <rdfs:range rdf:resource="http://www.univ-
batna.dz/elearning/LearnAnnot#Learner"/>
        <rdfs:domain rdf:resource="http://www.w3.org/ns/oa#Annotation"/>
    </owl:AnnotationProperty>


Thank you in advance.
Best regards
-- 
Fairouz KHADRAOUI
Assistant Teacher, Department of economic sciences
Batna 1 University
L@stic Laboratory    http://lab.univ-batna2.dz/lastic/
Batna 2  University