OldBookmark getBookmark(Address addr, String type) {
		OldBookmark bookmark = null;
		ObjectPropertyMap map = getMap(type, false);
		if (map != null) {
			bookmark = (OldBookmark) map.get(addr);
			if (bookmark != null) {
				bookmark.setContext(program, type);
			}
		}
		return bookmark;
	}
Get a specific bookmark type at the specified address.
@param addr program address
@param type bookmark type
@return bookmark or null if not found.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/bookmark/OldBookmarkManager.java