Re: [xml] xml schema validation

[Kasimier Buchcik <kbuchcik 4commerce de>]

Hi,

Kuperus, AgeJan wrote:
> We recently upgraded from libxml2 2.6.7 to 2.6.17 and discovered that
> the following xml, that was marked as valid in 2.6.7 is now marked as
> invalid:
>
> <wwwtest isn="103" xmlns="http://library.wur.nl/WebQuery/ns/wwwtest";
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> xsi:schemaLocation="http://library.wur.nl/WebQuery/ns/wwwtest
> http://library.wur.nl/WebQuery/ns/wwwtest.xsd";>
>         <elem>test</elem>
> </wwwtest>
>
> If we just create a prefix for it, it becomes valid again:
>
> <x:wwwtest isn="103" xmlns:x="http://library.wur.nl/WebQuery/ns/wwwtest";
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> xsi:schemaLocation="http://library.wur.nl/WebQuery/ns/wwwtest
> http://library.wur.nl/WebQuery/ns/wwwtest.xsd";>
>         <elem>test</elem>
> </x:wwwtest>
>
> Can anybody tell me why the first form is invalid ?

Your schema has a elementFormDefault="unqualified" attribute, which
states that locally declared elements are in no namespace.
When you used the default namespace, <elem> was bound to that namespace
as  well, which was not correct according to your schema. When you
removed the default namespace and prefixed it, and explicitely set
<x:wwwtest> to be in that namespace but not <elem>. So your latter case
is the correct one.

Libxml2 2.6.7 has a schema implementation dated of 2004-01-24. This
scenario wasn't handled correctly a year ago.

Regards,

Kasimier