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The HTML entities and ©, when included in an Eclipse help system plugin, do not display when viewing the Help system. See https://bugs.eclipse.org/bugs/show_bug.cgi?id=206367 for additional information.
Can you attach the page which contains these entities?
Created attachment 86877 [details] HTML file showing   and © entities
For an example running on help.eclipse.org, see http://help.eclipse.org/help33/index.jsp?topic=/org.eclipse.jpt.doc.user/ref_new_jpa_project_wizard.htm HTML file attached.
This is the same problem that was reported in Bug 189192. It is fixed for 3.4, in the meantime the workaround is to use integer values rather than entity names. *** This bug has been marked as a duplicate of bug 189192 ***
I'm going to reopen this because I think we may need to improve the way we determine entities. Ideally we would ship the DTDs with Eclipse (this will require IP approval) for the DTDs which exist today and then cache the lookup results for any other DTDs, which would include any DTDs created after Eclipse 3.4 is shipped.
Fixed in HEAD. We got the legal approval to include the xhtml dtds with Eclipse.