In 3.0b1, there is no XML or SGML catalog shipped. It
would be good to have one in the official source,
instead of each distro to write one.
Here is what I infered from comments in dtd files
PUBLIC "-//Norman Walsh//DTD Slides Full XML
V3.0b1//EN" "3.0b1/slides-full.dtd"
PUBLIC "-//Norman Walsh//DTD Slides XML V3.0b1//EN"
"3.0b1/slides-custom.dtd"
PUBLIC "-//Norman Walsh//DTD Slides XML V2.0//EN"
"3.0b1/slides.dtd"
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Fixed in V3.0b2