code: public Set<String> getValues(String property) {
  		Set<String> allValues = new HashSet<>();
  		for (PropertiesCoreExtension<T, ?, ?, ?> properties : propertiesMap
  				.values()) {
  			allValues.addAll(properties.getValues(property));
  		}
  		return allValues;
  	}
docs: Get the unique values for the property
  
  @param property
  property name
  @return set of values