code: public static ElementDescriptor<?> get(QualifiedName qname, XmlContext context)
  	{
  		if (context == null)
  		{
  			context = DEFAULT_CONTEXT;
  		}
  
  		synchronized (context)
  		{
  			final Map<QualifiedName, ElementDescriptor<?>> contextMap = context.DESCRIPTOR_MAP;
  			ElementDescriptor<?> result = contextMap.get(qname);
  			if (result != null)
  			{
  				return result;
  			}
  		}
  
  		synchronized (DEFAULT_CONTEXT)
  		{
  			return DEFAULT_CONTEXT.DESCRIPTOR_MAP.get(qname);
  		}
  	}
docs: Return the {@link ElementDescriptor} of the element having the given {@link QualifiedName} from the given {@link XmlContext}.
  
  @param qname
  The {@link QualifiedName} of the {@link ElementDescriptor} to return.
  @param context
  The {@link XmlContext}.
  @return The {@link ElementDescriptor} or <code>null</code> if there is no such element in the given {@link XmlContext}.