report.dtd is not valid

[sathieu]

With xsltproc from stretch:

$ xsltproc /root/.config/apt-dater/summary.xsl report.xml 
file:///usr/share/xml/schema/apt-dater/report.dtd:10: parser error : MixedContentDecl : '|' or ')*' expected
<!ELEMENT host (#PCDATA|status,ssh,kernel,lsb,history?,clusters?,packages)>
                              ^
file:///usr/share/xml/schema/apt-dater/report.dtd:10: parser error : expected '>'
<!ELEMENT host (#PCDATA|status,ssh,kernel,lsb,history?,clusters?,packages)>
                              ^
file:///usr/share/xml/schema/apt-dater/report.dtd:10: parser error : Content error in the external subset
<!ELEMENT host (#PCDATA|status,ssh,kernel,lsb,history?,clusters?,packages)>
                              ^
unable to parse report.xml

Workaround : add --novalid arg.