tes the date the object was created (datetime) in the system.&quot;</span><span class="o">@</span><span class="ge">en</span> <span class="p">;</span>
    <span class="nn">rdfs</span><span class="p">:</span><span class="nt">domain</span> <span class="p">[</span> <span class="kt">a</span> <span class="nn">owl</span><span class="p">:</span><span class="nt">Class</span> <span class="p">;</span>
            <span class="nn">owl</span><span class="p">:</span><span class="nt">unionOf</span> <span class="p">(</span