@Override
    public void endPrefixMapping(String prefix) {
    }
Content handler decorator that downgrades XHTML elements to
old-style HTML elements before passing them on to the decorated
content handler. This downgrading consists of dropping all namespaces
(and namespaced attributes) and uppercasing all element names.
Used by the {@link HtmlParser} to make all incoming HTML look the same.
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-html-module/src/main/java/org/apache/tika/parser/html/XHTMLDowngradeHandler.java