Don't mess with rdf for now

src/harmless.py

@@ -3,7 +3,7 @@ from . import abstract
 
 class HarmlessParser(abstract.AbstractParser):
     """ This is the parser for filetypes that do not contain metadata. """
-    mimetypes = {'application/xml', 'text/plain', 'application/rdf+xml'}
+    mimetypes = {'application/xml', 'text/plain'}
 
     def __init__(self, filename: str):
         self.filename = filename