diff --git a/interp/grid/__init__.py b/interp/grid/__init__.py
index a935cba..e88cc03 100644
--- a/interp/grid/__init__.py
+++ b/interp/grid/__init__.py
@@ -2,6 +2,8 @@ import sys
 import re
 from   collections import defaultdict
 
+from xml.dom.minidom import Document
+
 import numpy as np
 from scipy.spatial import KDTree
 
@@ -23,7 +25,7 @@ class grid(object):
       q     = array (1D) of physical values
     """
 
-    if verts:
+    if verts != None:
       self.verts = np.array(verts)
       self.tree           = KDTree(self.verts)
     if q:
@@ -142,6 +144,33 @@ class grid(object):
         r += "%s\n" % v
     return r
 
+  def normalize_q(self, new_max = 0.1):
+    largest_number = np.max(np.abs(self.q))
+    self.q *= new_max/largest_number
+
+
+
+  def get_xml(self):
+    doc = Document()
+    ps = doc.createElement("points")
+    doc.appendChild(ps)
+    for i in zip(self.verts, self.q):
+      p = doc.createElement("point")
+
+      p.setAttribute("x", str(i[0][0]))
+      p.setAttribute('y', str(i[0][1]))
+      p.setAttribute('z', str(i[0][2]))
+      p.setAttribute('q', str(i[1]   ))
+      ps.appendChild(p)
+
+    return doc
+
+  def toxml(self):
+    return self.get_xml().toxml()
+  def toprettyxml(self):
+    return self.get_xml().toprettyxml()
+
+
 
 
 class delaunay_grid(grid):