code: private Attribute getAttribute(MappedField configuredField, Class<?> configuredClass){
  		// If configuredClass exists in XML configuration file
  		for (Class<?> clazz : getAllsuperClasses(configuredClass))
  			if (isMapped(clazz))
  				// loads all configured attributes
  				for (Attribute attribute : loadAttributes().get(clazz.getName())) {
  
  					// verifies that exists the attribute written in XML in
  					// the configured Class
  					if (isNull(fieldName(clazz, attribute.getName())))
  						Error.attributeAbsent(clazz, attribute);
  
  					// if the field given in input isn't equal to xmlField
  					// continue with the cycle
  					if (attribute.getName().equals(configuredField.getValue().getName()))
  						return attribute;
  				}
  		return null;
  	}
docs: Returns the Attribute relative to the configured field, null otherwise.
  @param configuredField field to find
  @param configuredClass class of field
  @return