Further form the log I can see that you are using the VIX version of the plugin, Which has a sligthly different way of accessing the different websites.
Actually, I'm using the version from the rytec.be site:
enigma2-plugin-extensions-xmltvimport_1.0-r36_mipsel.ipk
modified a little to run on ppc boxes. This version is from
08/03/2011 so I guess rytec didn't update the site.
I also use the
enigma2-plugin-extensions-xmltvimport-rytec_20110303-r2_all.ipk sourcelist from the rytec.be and again it seems that rytec forgot to update it but I can do it manually now that you've posted the contents of the file.
This morning, the update was successful and the .dat file was as it should be ~6MB in size with epg on channels.