Mapping
If we want to use meta data over a variety of media formats the act of consolidating the meta data from different sources can be quite tiresome. For instance if you want to get the title of a media item you need to look at the IPTC Caption meta data for images, ID3 title for mp3 files, a RIFF or XMP meta data for video files and so on. To solve this using mapping we can create a user meta data and apply mapping from a set of meta data to allow the analyzer to automatically populate the title user meta data from a list of format specific meta data and take the first found meta data.