[xml/sgml-pkgs] Bug#832602: [libxml2] Schema validation with attribute checks fails (upstream #766834)

[Andre Naujoks]

Package: libxml2
Version: 2.9.4+dfsg1-1
Severity: important

--- Please enter the report below this line. ---

XML Schema validation fails, when attribute values are checked against a
pattern or otherwise non-empty attributes would not validate.

Attached are a very simple schema and an XML file, which validates with
2.9.3 but not with 2.9.4

The generated errors are:
# xmlstarlet val -e -s test.xsd test.xml
test.xml:1.18: Element 'Test', attribute 'test': [facet 'pattern'] The
value '' is not accepted by the pattern '.+'.
test.xml:1.18: Element 'Test', attribute 'test': '' is not a valid value
of the atomic type 'mytype'.
test.xml - invalid

The bug is known upstream: https://bugzilla.gnome.org/show_bug.cgi?id=766834

A patch is available there, too. The patch solves the problem.

I am not attaching the patch, because I did not write it.

There is a mailing-list thread, which mentions the patch and why it is
not yet applied, and it seems they are waiting for a review by the
author of libxml2, which did not happen until now.
https://mail.gnome.org/archives/xml/2016-June/msg00003.html

I'd like to ask, if Debian could carry the patch from the upstream
bug-tracker until it lands upstream and a new version is released,
because this bug breaks basically all schema validation, that is not
trivial.

Regards
  Andre

--- System information. ---
Architecture: amd64
Kernel:       Linux 4.6.0-1-amd64

Debian Release: stretch/sid
  500 unstable        ftp.de.debian.org   500 testing
ftp.de.debian.org     1 experimental    ftp.de.debian.org
--- Package information. ---
Depends                     (Version) | Installed
=====================================-+-=========================
libc6                       (>= 2.15) | libicu55                 (>=
55.1-1~) | liblzma5     (>= 5.1.1alpha+20120614) | zlib1g
 (>= 1:1.2.3.3) |

Recommends      (Version) | Installed
=========================-+-===========
xml-core                  | 0.13+nmu2


Package's Suggests field is empty.
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