<p>I added sorting for the modulespecs. That doesn't seem to be enough, attributes are still not ordered, and in fact I get more than ordering differences when I generate twice in a row on my machine...</p>

<p>The diff between two consecutive runs of update.py (with matplotlib 1.5.0rc2+57.ga83dead) contains:</p>

<div class="highlight highlight-source-diff"><pre><span class="pl-md">--- a/vistrails/packages/matplotlib14/artists.py</span>
<span class="pl-mi1">+++ b/vistrails/packages/matplotlib14/artists.py</span>
<span class="pl-mdr">@@ -3757,2 +3757,2 @@</span> class MplTickProperties(MplArtistProperties):
<span class="pl-md">-              ("labelcolor", "basic:String",</span>
<span class="pl-md">-                {'optional': True}),</span>
<span class="pl-mi1">+              ("label", "basic:String",</span>
<span class="pl-mi1">+                {'optional': True, 'docstring': 'Set the text of ticklabel'}),</span>
<span class="pl-mdr">@@ -3855,2 +3855,2 @@</span> class MplTickProperties(MplArtistProperties):
<span class="pl-md">-        if self.has_input('labelcolor'):</span>
<span class="pl-md">-            artist.constructor_props['labelcolor'] = self.get_input('labelcolor')</span>
<span class="pl-mi1">+        if self.has_input('label'):</span>
<span class="pl-mi1">+            artist.props['label'] = self.get_input('label')</span>
<span class="pl-md">--- a/vistrails/packages/matplotlib14/mpl_artists.xml</span>
<span class="pl-mi1">+++ b/vistrails/packages/matplotlib14/mpl_artists.xml</span>
<span class="pl-mdr">@@ -1854,1 +1854,3 @@</span> None, to remove the clipping path
<span class="pl-md">-    &lt;inputPortSpec arg="labelcolor" arg_pos="9" constructor_arg="True" name="labelcolor" /&gt;</span>
<span class="pl-mi1">+    &lt;inputPortSpec arg="label" name="label"&gt;</span>
<span class="pl-mi1">+      &lt;docstring&gt;Set the text of ticklabel&lt;/docstring&gt;</span>
<span class="pl-mi1">+    &lt;/inputPortSpec&gt;</span>
<span class="pl-md">--- a/vistrails/packages/matplotlib14/mpl_artists_diff.xml</span>
<span class="pl-mi1">+++ b/vistrails/packages/matplotlib14/mpl_artists_diff.xml</span>
<span class="pl-mdr">@@ -15,1 +15,1 @@</span>
<span class="pl-md">-  &lt;deletePortSpec code_ref="matplotlib.axis.Tick" port="clip_path" type="input" /&gt;</span>
<span class="pl-mi1">+  &lt;deletePortSpec code_ref="matplotlib.axis.Tick" port="label" type="input" /&gt;</span></pre></div>

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