title: Annotation in OWL API
body: <p>I am learning how to use OWL API, I found this API is not the same as the API I used before. I am trying to figure out some simple concepts.I can't understand "Annotation". I get these <a href="https://en.wikipedia.org/wiki/Web_Ontology_Language#OWL_abstract_syntax" rel="nofollow noreferrer">from wiki</a>:</p>
  
  <blockquote>
    <p>The OWL abstract syntax presents an ontology as a sequence of
    <em>annotations</em>, <em>axioms</em> and <em>facts</em>. Annotations carry machine and human
    oriented meta-data.</p>
  </blockquote>
  
  <p>If you are familiar with the owl, can you give me an example? What does "machine and human oriented meta-data" mean?
  Thanks a lot.</p>
  
  <hr>
  
  <p>Update:</p>
  
  <hr>
  
  <p>Thanks for answering me. I also want to write a example:</p>
  
  <pre><code>&lt;http://data.doremus.org/performance/4db95574-8497-3f30-ad1e-f6f65ed6c896&gt;
      a                      mus:M42_Performed_Expression_Creation ;
      ecrm:P3_has_note       "Créée par Teodoro Anzellotti, son commanditaire, en novembre 1995 à Rotterdam" ;
      ecrm:P4_has_time-span  &lt;http://data.doremus.org/performance/4db95574-8497-3f30-ad1e-f6f65ed6c896/time&gt; ;
      ecrm:P9_consists_of    [ a                        mus:M28_Individual_Performance ;
                               ecrm:P14_carried_out_by  "Teodoro Anzellotti"
                             ] ;
      ecrm:P9_consists_of    [ a                        mus:M28_Individual_Performance ;
                               ecrm:P14_carried_out_by  "à Rotterdam"
                             ] ;
      efrbroo:R17_created    &lt;http://data.doremus.org/expression/2fdd40f3-f67c-30a0-bb03-f27e69b9f07f&gt; ;
      efrbroo:R19_created_a_realisation_of
              &lt;http://data.doremus.org/work/907de583-5247-346a-9c19-e184823c9fd6&gt; ;
      efrbroo:R25_performed  &lt;http://data.doremus.org/expression/b4bb1588-dd83-3915-ab55-b8b70b0131b5&gt; .
  </code></pre>
  
  <hr>
  
  <p>I think there is annotation in this example, the object of "ecrm:P9_consists_of" is not annotation. If I want to add annotation to ecrm:P3_has_not, how to do that?
  Thanks a lot.</p>