Thanks for the reply. I have been using Calibre as it addresses all the problems in one fell swoop but it does create this extra problem.
I am trying to publish via lulu.com and, although the file passes the check in Sigil, these are the errors being reported via lulu's check:
ERROR: Unable to locate a valid publication date. A date with the event attribute publication (opf:event=publication) is required in OEBPS/content.opf
ERROR: Unable to locate a valid creator. A creator with the author role (role=aut) and the file-as attribute is required in OEBPS/content.opf
ERROR: IOException: Unresolved external XML entity: 'http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd' in OEBPS/Text/DSD2.xhtml
ERROR: Unable to locate element with id 'sigil_toc_id_1' in OEBPS/toc.ncx
ERROR: Unable to locate element with id 'sigil_toc_id_2' in OEBPS/toc.ncx
ERROR: Unable to locate element with id 'sigil_toc_id_3' in OEBPS/toc.ncx
ERROR: Unable to locate element with id 'sigil_toc_id_4' in OEBPS/toc.ncx
ERROR: Unable to locate element with id 'sigil_toc_id_5' in OEBPS/toc.ncx
ERROR: Unable to locate element with id 'sigil_toc_id_6' in OEBPS/toc.ncx
ERROR: Unable to locate element with id 'sigil_toc_id_7' in OEBPS/toc.ncx
ERROR: Unable to locate element with id 'sigil_toc_id_8' in OEBPS/toc.ncx
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