How to monkey patch to get key value pairs when the parent element is different but child elements are namespaced the same

What steps will reproduce the problem?

I have (Word Press) namespaced markup that looks like:

<wp:postmeta>
  <wp:meta_key>_edit_last</wp:meta_key>
  <wp:meta_value><![CDATA[6]]></wp:meta_value>
</wp:postmeta>

I can retrieve this fine with my current monkey patching. However, I also have 
blocks like this:

<wp:commentmeta>
  <wp:meta_key>akismet_result</wp:meta_key>
  <wp:meta_value><![CDATA[false]]></wp:meta_value>
</wp:commentmeta>

This replaces my values for wp_meta_key and wp_meta_value because my monkey 
patching doesn't take into account the parent elements (in this case, 
wp_postmeta and wp_commentmeta respectively).

I know how to monkey patch. I don't know how to determine the parent element 
and assign the key value pairs to specific parent elements. Please advise.

What is the expected output? What do you see instead?

I see the last entry of my wp_postmeta object (created by my monkey patches) 
replaced with the key and value of the entry of the wp_commentmeta object.

What I want to see is:

wp_postmeta = [{'wp_meta_value': u'6', 'wp_meta_key': u'_edit_last'}]
wp_commentmeta = [{'wp_meta_value': u'false', 'wp_meta_key': u'akismet_result'}]

What I end up seeing is:

wp_postmeta = [{'wp_meta_value': u'false', 'wp_meta_key': u'akismet_result'}]

What version of the product are you using? On what operating system?

5.1.3, OS X Yosemite, Python 2.7.5

Please provide any additional information below.

I can provide additional info as needed. What I really need (and have asked for 
before in June, 2014) is a guide on monkey patching best practices. Right now 
it is just trial and error. Looking at the source doesn't give much of a guide 
as it is not commented sufficiently with explanations as to what does what. 
Thanks in advance.

Original issue reported on code.google.com by robertln...@gmail.com on 20 Oct 2014 at 11:20

The issue names no source file or test. Reproduce the two namespaced XML fragments described with Python 2.7.5 and compare the resulting wp_postmeta and wp_commentmeta values. Inspect the parser's namespace and monkey-patching behavior; done means parent-specific collections preserve both key/value pairs without replacement.