code: private static String getProperPrefixURI(String prefixUri) {
  		if (!prefixUri.endsWith("#")) {
  			if (!prefixUri.endsWith("/")) {
  				String defaultSeparator = EntityCreationPreferences.getDefaultSeparator();
  				if (!prefixUri.endsWith(defaultSeparator))  {
  					prefixUri += defaultSeparator;
  				}
  			}
  		}
  		return prefixUri;
  	}
docs: A utility method to ensure a proper naming for prefix URI