From 96503d22fd26c904ab3a97a89871e723c19b241c Mon Sep 17 00:00:00 2001
From: Philipp Rudiger <P.Rudiger@ed.ac.uk>
Date: Mon, 24 Oct 2016 14:23:27 +0100
Subject: [PATCH] Mapping types complain when supplied with vdims

---
 holoviews/core/ndmapping.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/holoviews/core/ndmapping.py b/holoviews/core/ndmapping.py
index 1936b4ca17..62eddf8ef3 100644
--- a/holoviews/core/ndmapping.py
+++ b/holoviews/core/ndmapping.py
@@ -87,6 +87,8 @@ class MultiDimensionalMapping(Dimensioned):
 
     kdims = param.List(default=[Dimension("Default")], constant=True)
 
+    vdims = param.List(default=[], bounds=(0, 0), constant=True)
+
     data_type = None          # Optional type checking of elements
     _deep_indexable = False
     _sorted = True