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You have discovered that reading applications, make little use of all the metadata in a book. The (optional) role and file-as attributes are also seldom used. Books can even have several titles (I created a multilingual version of the Divine Comedy with the title in several languages), but I know of no application (not even Calibre) that handles this.
In addition, there are some pieces of metadata for which there's no standard way to specify them, such series title and number.
However, I'd advise against some workarounds you might be tempted to use, like putting all authors in a single <dc:creator> tag ("John Jones, Martin Martinson and Philip Philippoussis"), or including the series in the book title ("The Final Trilogy II: Sequel"). This only disencourages proper metadata handling.
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