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      <title>Modeling Concepts</title>
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      <div class="title_topic2" id="xps10_pagetitle">Modeling Concepts</div>
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         <dt><a name="ndxgenid_roadmap986"></a><p class="defObject">BORN coordinate system</p>
         </dt>
         <dd>
            <p class="para_defMeaning">In NX, a <b class="uiTerm">Datum CSYS</b> can be used to establish a similar set of datum reference planes and axes.
            </p>
            <p class="para_defMeaning">See also:</p>
            <ul class="unmarkedList">
               <li class="condense"><a class="links" href="javascript:void(0)" onclick="top.openFile('roadmap/05qt_parts_14.html');return(false);">Base feature strategy</a><p class="para_defMeaning"><a class="links" href="javascript:void(0)" onclick="top.openFile('roadmap/05qt_parts_21.html');return(false);">Datum features</a></p>
               </li>
            </ul>
         </dd>
      </dl>
      <dl>
         <dt><a name="ndxgenid_roadmap987"></a><p class="defObject">Entity</p>
         </dt>
         <dd>
            <p class="para_defMeaning">NX usually uses the general term &ldquo;object.&rdquo;</p>
            <p class="para_defMeaning">See also:</p>
            <ul class="unmarkedList">
               <li class="condense"><a class="links" href="javascript:void(0)" onclick="top.openFile('roadmap/02qt_nx_basics_28.html');return(false);">Selecting</a></li>
            </ul>
         </dd>
      </dl>
      <dl>
         <dt><a name="ndxgenid_roadmap988"></a><p class="defObject">Global coordinate system</p>
         </dt>
         <dd>
            <p class="para_defMeaning">NX refers to this as the absolute coordinate system.</p>
            <p class="para_defMeaning">See also:</p>
            <ul class="unmarkedList">
               <li class="condense"><a class="links" href="javascript:void(0)" onclick="top.openFile('roadmap/02qt_nx_basics_36.html#qt_nx_coordinates');return(false);">Local and global coordinates</a><p class="para_defMeaning"><a class="links" href="javascript:void(0)" onclick="top.openFile('roadmap/02qt_nx_basics_36.html');return(false);">Working coordinate system (WCS)</a></p>
               </li>
            </ul>
         </dd>
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      <dl>
         <dt><a name="ndxgenid_roadmap989"></a><p class="defObject">Open part</p>
         </dt>
         <dd>
            <p class="para_defMeaning">NX refers to open surfaces as sheet bodies.</p>
            <p class="para_defMeaning">See also:</p>
            <ul class="unmarkedList">
               <li class="condense"><a class="links" href="javascript:void(0)" onclick="top.openFile('roadmap/05qt_parts_3.html');return(false);">Part structure</a><p class="para_defMeaning"><a class="links" href="javascript:void(0)" onclick="top.openFile('roadmap/06qt_surface_6.html');return(false);">Non-manifold geometry</a></p>
                  <p class="para_defMeaning"><a class="links" href="javascript:void(0)" onclick="top.openFile('roadmap/06qt_surface_3.html');return(false);">Creating surfaces</a></p>
               </li>
            </ul>
         </dd>
      </dl>
      <dl>
         <dt>
            <p class="defObject">Reference line</p>
         </dt>
         <dd>
            <p class="para_defMeaning">NX uses the term datum axis.</p>
            <p class="para_defMeaning">See also:</p>
            <ul class="unmarkedList">
               <li class="condense"><a class="links" href="javascript:void(0)" onclick="top.openFile('roadmap/05qt_parts_21.html');return(false);">Datum features</a><p class="para_defMeaning"><a class="links" href="javascript:void(0)" onclick="top.openFile('roadmap/05qt_parts_27.html');return(false);">Revolve</a></p>
               </li>
            </ul>
         </dd>
      </dl>
      <dl>
         <dt>
            <p class="defObject">Reference plane</p>
         </dt>
         <dd>
            <p class="para_defMeaning">NX uses the term datum plane.</p>
            <p class="para_defMeaning">See also:</p>
            <ul class="unmarkedList">
               <li class="condense"><a class="links" href="javascript:void(0)" onclick="top.openFile('roadmap/05qt_parts_21.html');return(false);">Datum features</a></li>
            </ul>
         </dd>
      </dl>
      <dl>
         <dt><a name="ndxgenid_roadmap990"></a><p class="defObject">Volume</p>
         </dt>
         <dd>
            <p class="para_defMeaning">In NX, a .prt file can contain multiple solid bodies.</p>
            <p class="para_defMeaning">A .prt file can contain multiple solid body objects. These would normally be kept on different layers.</p>
            <p class="para_defMeaning">See also:</p>
            <ul class="unmarkedList">
               <li class="condense"><a class="links" href="javascript:void(0)" onclick="top.openFile('roadmap/05qt_parts_3.html');return(false);">Part structure</a><p class="para_defMeaning"><a class="links" href="javascript:void(0)" onclick="top.openFile('roadmap/06qt_surface_6.html');return(false);">Non-manifold geometry</a></p>
               </li>
            </ul>
         </dd>
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