[xml/sgml-pkgs] Bug#288149: trang: conversion from XML and attributes with a default value

[Samuel Thibault]

reassign 288149 libxml2-utils
subscribe 288149
thanks

Vincent Lefevre, le Wed 23 Sep 2009 01:07:58 +0200, a écrit :
> On 2009-09-22 23:00:39 +0200, Samuel Thibault wrote:
> > Mmm, I'm not sure I'm able to understand what this means (I'm not that
> > into XML/DTDs).  Does it mean you agree that this isn't a trang bug
> > actually, and possibly rather a bug in xmllint (in which case it should
> > be reassigned)?
> 
> Yes, I think it's a bug in xmllint for the following reason.

Ok, reassigning. xml2 maintainers: the summary below seems to be
complete but you may want to read the start of the bug report for the
actual testcase at stake.

> The question is whether an attribute given in the DTD with a default
> value (but not in the start tag of an element) is regarded as present
> or not for RELAX NG validation. According to the RELAX NG spec, the
> data model is based on the infoset obtained when all declaractions of
> the DTD are processed. According to the infoset spec[*], attributes
> that have a default value are part of the infoset. The information
> concerning a default value is provided by the [specified] property:
> 
>   [specified] A flag indicating whether this attribute was actually
>   specified in the start-tag of its element, or was defaulted from
>   the DTD.
> 
> Let's get back to RELAX NG. Its spec doesn't say anything concerning
> this [specified] property. This means that the origine of an attribute
> (start tag or default value in DTD) is ignored, i.e. an attribute
> specified in a start tag and an attribute with default value in the
> DTD are regarded as equivalent for RELAX NG.
> 
> [*] http://www.w3.org/TR/xml-infoset/

Samuel