diff --git a/atom.go b/atom.go
index 82715a4..a8f16bd 100644
--- a/atom.go
+++ b/atom.go
@@ -1,8 +1,14 @@
 package atomfeed
 
+import "strings"
+
 type (
 	EmailAddress string
 	LanguageTag  string
 	MediaType    string
 	URI          string
 )
+
+func isXMLMediaType(mediaType string) bool {
+	return strings.HasSuffix(mediaType, "/xml") || strings.HasSuffix(mediaType, "+xml")
+}
diff --git a/entry.go b/entry.go
index 458fcf4..0cac599 100644
--- a/entry.go
+++ b/entry.go
@@ -59,10 +59,6 @@ func alternateRelExists(l []*Link) bool {
 	return false
 }
 
-func isXMLMediaType(mediaType string) bool {
-	return strings.HasSuffix(mediaType, "/xml") || strings.HasSuffix(mediaType, "+xml")
-}
-
 func (e *Entry) AddExtension(name string, value any) {
 	e.Extensions = append(e.Extensions, &ExtensionElement{XMLName: xml.Name{Local: name}, Value: value})
 }