private String[] getTypes() {
		ArrayList<String> list = new ArrayList<String>();
		Iterator<String> iter = propertyMgr.propertyManagers();
		while (iter.hasNext()) {
			String property = iter.next();
			String type = getBookmarkType(property);
			if (type != null && !list.contains(type)) {
				try {
					propertyMgr.getObjectPropertyMap(property);
					list.add(type);
				}
				catch (TypeMismatchException e) {
				}
			}
		}
		String[] types = new String[list.size()];
		list.toArray(types);
		return types;
	}
Return all the Bookmark types currenly in use.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/bookmark/OldBookmarkManager.java