@Override
        public void startElement(String uri, String localName, String qName, Attributes atts)
                throws SAXException {
            if ("cmAuthor".equals(localName)) {
                for (int i = 0; i < atts.getLength(); i++) {
                    if ("id".equals(atts.getLocalName(i))) {
                        id = atts.getValue(i);
                    } else if ("name".equals(atts.getLocalName(i))) {
                        name = atts.getValue(i);
                    } else if ("initials".equals(atts.getLocalName(i))) {
                        initials = atts.getValue(i);
                    }
                }
                commentAuthors.add(id, name, initials);
                //clear out
                id = null;
                name = null;
                initials = null;
            }
        }
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