Check uris before applying them

id.go

@@ -10,9 +10,13 @@ type ID struct {
 	URI IRI `xml:",chardata"`
 }
 
-// NewID creates a new ID. It returns a *ID.
-func NewID(uri IRI) *ID {
-	return &ID{URI: IRI(uri)}
+// NewID creates a new ID. It returns a *ID and an error.
+func NewID(uri IRI) (*ID, error) {
+	if !isValidIRI(uri) {
+		return nil, fmt.Errorf("uri %v not correctly formatted", uri)
+	}
+
+	return &ID{URI: IRI(uri)}, nil
 }
 
 // Check checks the ID for incompatibilities with RFC4287. It returns an error.