[cairo] using expat for libsvg

[Keith Packard]

Around 17 o'clock on Jan 2, Chris wrote:

> How hard would it be to make fontconfig use libxml2?  Is all of the
> fontconfig XML stuff related to the configuration file?

It's only for the configuration file, but I want to make which XML library 
is used a compile-time option, so I need some common abstraction which 
will work atop either library.

I started this work but gave up when I realized that fontconfig uses expat 
in a way which is far different from any model exposed by libxml2.

Fontconfig also asserts that configuration files are always in UTF-8 
encoding, which eliminates most of the potential problems with using 
expat, so there wasn't a huge push to use libxml2.

-keith


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