Move the parsing of the media type to isXMLMediaType

atom.go

@@ -1,6 +1,9 @@
 package atomfeed
 
-import "strings"
+import (
+	"mime"
+	"strings"
+)
 
 type (
 	EmailAddress string
@@ -10,5 +13,10 @@ type (
 )
 
 func isXMLMediaType(mediaType string) bool {
+	mediaType, _, err := mime.ParseMediaType(mediaType)
+	if err != nil {
+		return false
+	}
+
 	return strings.HasSuffix(mediaType, "/xml") || strings.HasSuffix(mediaType, "+xml")
 }

entry.go

@@ -4,7 +4,6 @@ import (
 	"encoding/xml"
 	"errors"
 	"fmt"
-	"mime"
 	"strings"
 )
 
@@ -144,10 +143,7 @@ func (e *Entry) Check() error {
 		// "type" attribute of atom:content is a MIME media type [MIMEREG], but
 		// is not an XML media type [RFC3023], does not begin with "text/", and
 		// does not end with "/xml" or "+xml".
-		mediaType, _, err := mime.ParseMediaType(e.Content.getType())
-		if err != nil {
-			return fmt.Errorf("type attribute of content element of entry %v: %v", e.ID.URI, err)
-		}
+		mediaType := e.Content.getType()
 		if !isXMLMediaType(mediaType) && !strings.HasPrefix(mediaType, "text/") {
 			return fmt.Errorf("no summary element of entry %v but media type not xml", e.ID.URI)
 		}