@SuppressWarnings("unchecked")
public void clear()
  {
  	Enumeration<?> enu = definedAttributes.elements();
  	while( enu.hasMoreElements() )
  	{
  		Attribute<T> attr = (Attribute<T>) enu.nextElement();
  		attr.clear();
  	}
  }
Clears all of the attributes managed by this AttributeManager 
while leaving the attributes defined.
Ghidra/Framework/Generic/src/main/java/ghidra/util/graph/attributes/AttributeManager.java