[ome-devel] XML::LibXML and Later Versions of libxml2

[Ilya Goldberg]

Thanks for that, Chris.
I think its worth-while thinking about packaging some of these  
dependencies with the code-base or at least the distribution (like  
its done with Java).
We could go all the way and package all of the perl dependencies and  
call "use lib /OME/perl/deps".  That would be equivalent to a Java  
distro with a CLASSPATH.
Its not the "style" outside of Java for OSS apps, but we could  
certainly adopt it for perl and still not step on anybody's toes.  It  
would get around all kinds of installation issues.
What do you think of that?
-Ilya

On May 12, 2006, at 6:57 AM, Chris Allan wrote:

> Hello all,
>
> Over the past couple of days I've been fighting with some OME install
> problems that have come down to XML parsing errors. First, some
> background:
>
> callan at valewalker OME $ equery list libxml2
> [ Searching for package 'libxml2' in all categories among: ]
> * installed packages
> [I--] [  ] dev-libs/libxml2-2.6.23 (2)
>
> Our good friend Christian Glahn (phish) who wrote much of the
> XML::LibXML Perl module has not released a new version in over 2
> years. Normally this wouldn't be a problem, however libxml2
> development has happily moved forward (http://xmlsoft.org/news.html)
> since the 1.58 release of XML::LibXML on the 4th April of 2004. In
> fact, there have been no less than 15 libxml2 releases since then (my
> Gentoo libxml2-2.6.23 being based on the 14th).
>
> Now, since XML::LibXML provides Perl bindings to the libxml2 C
> library using Swig and Perl XS, libxml2 API changes can affect things
> in weird and wonderful ways such as "Bad file descriptors" errors
> when attempting to load certain OME XML files during an OME install.
> Less than pleasant, less than descriptive and a little bit arcane.
> However, there is a solution...
>
> Through the power of CVS tree hunting and pecking (http://axkit.org/
> cgi-bin/viewcvs.cgi/XML-LibXML/ and http://axkit.org/cvs.xml for
> those interested) I've now got a working install using a CVS version
> of XML::LibXML. Checkout here: http://users.openmicroscopy.org.uk/
> ~callan/XML-LibXML-20060512.tar.bz2
>
> If you've got later versions of libxml2 and are having general XML
> parsing weirdness, might want to give an install of that a try.
>
> Ciao.
>
> -Chris
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