diff --git a/packages.lisp b/packages.lisp
index 0074246..eef941d 100644
--- a/packages.lisp
+++ b/packages.lisp
@@ -71,7 +71,10 @@
 	   #:sentence-equal
 
 	   #:apply-rules
-	   #:apply-rules-from-files))
+	   #:apply-rules-from-files
+
+	   #:convert-rdf
+	   #:convert-rdf-file))
   
 
 (defpackage #:conllu-prolog
diff --git a/rdf.lisp b/rdf.lisp
index 8e76395..7d9cc20 100644
--- a/rdf.lisp
+++ b/rdf.lisp
@@ -59,7 +59,7 @@
   (with-output-to-string (s)
     (mapcar (lambda (m)
               (format s "conll:m~a a conll:MetadataKey .~%" (string-downcase (car m)))
-              (format s "conll:m~a rdfs:label ~a .~%" (string-downcase (car m)) 
+              (format s "conll:m~a rdfs:label ~a .~%" (cl-ppcre:regex-replace-all " " (string-downcase (car m)) "_")
                       (make-literal (car m)))) metadata)
     s))