@Override
        public void characters(char[] ch, int start, int length) throws SAXException {
            if (!inPH) {
                wrappedHandler.characters(ch, start, length);
            }
        }
In PowerPoint files, slides have things embedded in them,
and slide drawings which have the images
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/main/java/org/apache/tika/parser/microsoft/ooxml/SXSLFPowerPointExtractorDecorator.java