public Set<MediaType> getSupportedTypes(ParseContext context) {
        return Collections.emptySet(); // not a top-level parser
    }
Parser for EPUB OPS <code>*.html</code> files.
<p>
For the time being, assume XHTML (TODO: DTBook)
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-miscoffice-module/src/main/java/org/apache/tika/parser/epub/EpubContentParser.java