The three subtypes to RE_RegisteredItem are LC_ClassCharacteristicDescriptorItem, LC_ElementCharacteristicDescriptorItem and LC_ElementDescriptorItem. These subtypes take the same form and include the following attributes:<br/><br/><ul>
<li>A definition of the registered LCML metalanguage object;</li><li>A description of any metalanguage object attributes to the LCML metalanguage object;</li><li>A reference to the parent class in the LCML metalanguage model (either from the standard or another registered class) together with an indication of the type of relationship such as: subtype, component, enumeration, code list;</li><li>A reference to any LCML metalanguage object which this metalanguage object supersedes (i.e. causes to be deprecated).</li></ul>
<br/>NOTE LC_Element objects may only be extended; that is, an instance of the registered item may be superseded only by another instance that contains all of the information from the superseded registered item.<br/><br/><br/>