minidom: wrong processing of xmlns attributes

[vporton]

BPO	34306
Nosy	@vporton

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2018-08-25.22:58:09.569>
created_at = <Date 2018-08-01.13:32:29.595>
labels = ['expert-XML', 'invalid', 'type-bug', '3.7']
title = 'minidom: wrong processing of xmlns attributes'
updated_at = <Date 2018-08-25.22:58:09.568>
user = 'https://github.com/vporton'

bugs.python.org fields:

activity = <Date 2018-08-25.22:58:09.568>
actor = 'porton'
assignee = 'none'
closed = True
closed_date = <Date 2018-08-25.22:58:09.569>
closer = 'porton'
components = ['XML']
creation = <Date 2018-08-01.13:32:29.595>
creator = 'porton'
dependencies = []
files = []
hgrepos = []
issue_num = 34306
keywords = []
message_count = 2.0
messages = ['322860', '324106']
nosy_count = 1.0
nosy_names = ['porton']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue34306'
versions = ['Python 2.7', 'Python 3.6', 'Python 3.7']

[vporton]

The below script prints

http://www.w3.org/2000/xmlns/
aa:aa

It should print

None
aa:aa

because xmlns:z is NOT an attribute of xmlns namespace.

import xml.dom.minidom

```py
x = xml.dom.minidom.parseString("<x xmlns:z='aa:aa' z:q='1'/>")

for i in x.documentElement.attributes.values():
    print(i.namespaceURI)

[vporton]

My bug report was wrong:

https://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/core.html
In the DOM, all namespace declaration attributes are by definition bound to the namespace URI: "http://www.w3.org/2000/xmlns/". These are the attributes whose namespace prefix or qualified name is "xmlns" as introduced in [XML Namespaces 1.1].