thinkbayes DocBook: one display equation has spurious commas about thinkstats HOT 7 CLOSED

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Ok, I've got a lead on this.  The problem is actually in plasTeX.  Tralics 
generates <mfenced> tags with appropriate attributes.  I had to modify 
tree_cleaner to make sure the attributes survived my post-processing of the 
output from tralics.  

I'm pretty sure that is working now, but the attributes are still not appearing 
in the DocBook output.

Here's what the plasTeX representation looks like after the tree_cleaner:

<informalequation id="a0000000057">
<mmlmath id="a0000000058">
    <plastex:arg name="mode">display</plastex:arg>
<mmlmfenced id="a0000000059">
    <plastex:arg name="close">]</plastex:arg>
    <plastex:arg name="open">[</plastex:arg>
    <plastex:arg name="separators"></plastex:arg>
<mmlmo id="a0000000060">
-</mmlmo><mmlmfrac id="a0000000061">
<mmlmn id="a0000000062">
1</mmlmn><mmlmn id="a0000000063">
2</mmlmn></mmlmfrac><mmlmsup id="a0000000064">
<mmlmfenced id="a0000000065">
    <plastex:arg name="close">)</plastex:arg>
    <plastex:arg name="open">(</plastex:arg>
    <plastex:arg name="separators"></plastex:arg>
<mmlmfrac id="a0000000066">
<mmlmrow id="a0000000067">
<mmlmi id="a0000000068">
x</mmlmi><mmlmo id="a0000000069">
-</mmlmo><mmlmi id="a0000000070">
μ</mmlmi></mmlmrow><mmlmi id="a0000000071">
σ</mmlmi></mmlmfrac></mmlmfenced><mmlmn id="a0000000072">
2</mmlmn></mmlmsup></mmlmfenced></mmlmath></informalequation>

So at this point the tags have the appropriate attributes.  But here's the 
DocBook:

<informalequation><mml:math overflow="scroll" xmln
s:mml="http://www.w3.org/1998/Math/MathML"><mml:mfenced><mml:mo>-</mml:mo><mml:m
frac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac><mml:msup><mml:mfenced><mml
:mfrac><mml:mrow><mml:mi>x</mml:mi><mml:mo>-</mml:mo><mml:mi>μ</mml:mi></mml:mr
o
w><mml:mi>σ</mml:mi></mml:mfrac></mml:mfenced><mml:mn>2</mml:mn></mml:msup></mm
l
:mfenced></mml:math></informalequation>

No attributes.

I am looking at Renderers/DocBook/Math.zpts, which contains this:

name: mmlmfenced
<mml:mfenced tal:content="self"></mml:mfenced>

So I wonder if I am confused about this template.  Tim, can you shed any light 
on this?

So the element should look like this, right?
<mml: mfenced open="[" close="]">

I think the template should be:
<mml:mfenced tal:attributes="open self/attributes/open 
close;self/attributes/close" tal:content="self"></mml:mfenced>

oops. <mml:mfenced tal:attributes="open self/attributes/open; close 
self/attributes/close" tal:content="self"></mml:mfenced>

Yes, that worked.  Thanks again, Tim!

I found a few more attributes that were not getting rendered in the MathML, and 
updated the templates.  I also added code that detects other attributes that 
are not yet rendered and issues a warning if they get used.