comps.xml has doctype with invalid dtd reference
yum distributor's generated comps.xml files contain the doctype declaration:
<!DOCTYPE comps PUBLIC "-//Red Hat, Inc.//DTD Comps info//EN" "comps.dtd">
Attempting to fetch that comps.dtd URI will fail (there's no such file provided
relative to the comps.xml file or anywhere else as far as I can tell).
This probably doesn't matter too much but I've filed this bug mainly for this
reason: the python 3 XML SAX parser in its default configuration will attempt
to fetch external entities, and will crash since comps.dtd can't be loaded.
Other tools, such as
xmllint --loaddtd, will also complain.