diff --git a/atom.go b/atom.go
index 0a11cb1..59ea2df 100644
--- a/atom.go
+++ b/atom.go
@@ -12,25 +12,9 @@ type (
 	EmailAddress string
 	LanguageTag  string
 	MediaType    string
-	// URI          string
-	IRI string
+	IRI          string
 )
 
-// func isValidURL(uri URI) bool {
-// 	_, err := url.ParseRequestURI(string(uri))
-// 	return err == nil
-// }
-//
-// func isValidURN(uri URI) bool {
-// 	pattern := `\A(?i:urn:(?!urn:)(?<nid>[a-z0-9][a-z0-9-]{1,31}):(?<nss>(?:[-a-z0-9()+,.:=@;$_!*'&~\/]|%[0-9a-f]{2})+)(?:\?\+(?<rcomponent>.*?))?(?:\?=(?<qcomponent>.*?))?(?:#(?<fcomponent>.*?))?)\z`
-// 	return regexp.MustCompile(pattern).MatchString(string(uri))
-// }
-//
-// // isValidURI checks whether an URI is valid or not.
-// func isValidURI(uri URI) bool {
-// 	return isValidURL(uri) || isValidURN(uri)
-// }
-
 // isValidIRI checks whether an IRI is valid or not. It returns a bool.
 // The used pattern stems from
 // https://www.w3.org/2011/04/XMLSchema/TypeLibrary-IRI-RFC3987.xsd.