add new variant of voc-slug without integer event id

validator/xsd/schedule.xml.xsd

@@ -88,7 +88,7 @@
       <xs:element type="start" name="start"/>
       <xs:element type="duration" name="duration"/>
       <xs:element type="xs:string" name="abstract"/>
-      <xs:element type="voc-slug" name="slug"/>
+      <xs:element type="voc-slug-new" name="slug"/>
       <xs:element type="xs:string" name="track"/>
       <!-- logo is the path or URL to an image, we use httpURI as type here as apps prefer full URLs now -->
       <xs:element type="emptyOrURI" name="logo" minOccurs="0" />
@@ -146,6 +146,12 @@
     </xs:restriction>
   </xs:simpleType>
 
+  <xs:simpleType name="voc-slug-new">
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[a-z0-9_]{4,}-[a-z0-9\-_]{4,}"/>
+    </xs:restriction>
+  </xs:simpleType>
+
   <xs:simpleType name="slug">
     <xs:restriction base="xs:string">
       <xs:pattern value="[a-z0-9-]{2,}"/>

voc/tools.py

@@ -190,7 +190,7 @@ def str2timedelta(s):
 
 def parse_json(text):
     # this more complex way is necessary
-    # to maintain the same order as in the input file
+    # to maintain the same order as in the input file in python2
     return json.JSONDecoder(object_pairs_hook=OrderedDict).decode(text)