From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030922
Description of problem:
The i386 version of libxml2 is missing from the x86_64 channel.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. run a program linked with libxml2 on a i386
2. watch it fail
In addition, trying to use the packages from the i386 version will
fail for the libxml2-devel subpackage since the binary
/usr/bin/xml2-config exists for both architectures.
This is fixed in U4.