void add(String id, String name, String initials) {
            if (id == null) {
                return;
            }
            if (name != null) {
                nameMap.put(id, name);
            }
            if (initials != null) {
                initialMap.put(id, initials);
            }
        }
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