Empty list is returned on DTD attributes

[Removed by request]

The following code returns an empty attribute list on the DTD element test but it has an attribute in the xml document:

#!/usr/bin/python3 -BEOObbs
# coding=utf-8

import io, lxml.etree

xml = lxml.etree.parse(io.BytesIO(b'''<?xml
 version='1.1'
 encoding='utf-8'
?>
<!DOCTYPE root [
 <!ATTLIST test
  attr (A | B | C) 'B'
 >
 <!ELEMENT test (#PCDATA)>
 <!ELEMENT root (test)*>
]>
<root></root>'''))
element = xml.docinfo.internalDTD.elements()[0]
print(element.name)
print(element.attributes())

This is the output:

sworddragon@ubuntu:~/tmp$ ./test.py
test
[]

Used versions:

Python : sys.version_info(major=3, minor=3, micro=3, releaselevel='final', serial=0)
lxml.etree : (3, 3, 0, -98)
libxml used : (2, 9, 1)
libxml compiled : (2, 9, 1)
libxslt used : (1, 1, 28)
libxslt compiled : (1, 1, 28)

[scoder (scoder)]

Thanks for the report and the test code. I can confirm this, and it applies only to internal/external subsets, not DTDs parsed independently. Working on a fix.

[scoder (scoder)]

https://github.com/lxml/lxml/commit/4ab9f6efe52bda0043ed36ebc017d0177ccc618a

[scoder (scoder)]

This is better as it additionally avoids keeping the document itself alive:

https://github.com/lxml/lxml/commit/3923cb727ac2cc0a5e4152ed42071be8a323fa5b

[scoder (scoder)]

Fixed in lxml 3.3.0.