diff --git a/Lib/mimetypes.py b/Lib/mimetypes.py
index 3d6510e23d0..f15160f774b 100644
--- a/Lib/mimetypes.py
+++ b/Lib/mimetypes.py
@@ -201,6 +201,7 @@ def read_mime_types(file):
     '.qt': 'video/quicktime',
     '.ras': 'image/x-cmu-raster',
     '.rgb': 'image/x-rgb',
+    '.rdf': 'application/xml',
     '.roff': 'application/x-troff',
     '.rtf': 'application/rtf',
     '.rtx': 'text/richtext',
@@ -228,6 +229,7 @@ def read_mime_types(file):
     '.wav': 'audio/x-wav',
     '.xbm': 'image/x-xbitmap',
     '.xml': 'text/xml',
+    '.xsl': 'application/xml',
     '.xpm': 'image/x-xpixmap',
     '.xwd': 'image/x-xwindowdump',
     '.zip': 'application/zip',