Instanciate common attributes everywhere so one can simply use the extend method

inlineOtherContent.go

@@ -17,7 +17,12 @@ type InlineOtherContent struct {
 // *InlineOtherContent and an error.
 func newInlineOtherContent(mediaType string, content any) *InlineOtherContent {
 	mediaType, _, _ = mime.ParseMediaType(mediaType)
-	return &InlineOtherContent{Type: mediaType, AnyElement: content}
+
+	return &InlineOtherContent{
+		CommonAttributes: newCommonAttributes(),
+		Type:             mediaType,
+		AnyElement:       content,
+	}
 }
 
 // isContent checks whether the InlineOtherContent is a Content. It returns a