Maybe I'm not fully understanding your question, but what about having a class (call it "pub" or whatever) and then defining font-style: italic in the CSS?
Creating a custom class will yield the desired visual effect, however the class "pub" has no semantic value.
Compare this to text marked-up with a heading tag;
<h1>Heading text</h1>
The text enclosed by this standard HTML tag is defined as a heading. Applying a class to the <h1>, e.g.
<h1 class="pub">Publication title</h1>
does not describe the text "Publication title" as a publication.
-- Andy Kirkwood | Creative Director
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