mp,mp2,mp3和mp4檔的分別?

mp-mp3:This program is a compiler to parse formal metadata, checking the syntax against the FGDC Content Standard for Digital Geospatial Metadata and generating output suitable for viewing with a web browser or text editor. It runs on Linux and UNIX systems and on PC's running all versions of Microsoft Windows (95 and up including XP). MP generates a textual report indicating errors in the metadata, primarily in the structure but also in the values of some of the scalar elements (that is, those whose values are restricted by the standard).
mp4:http://mobile.my-life.net/downloads.php?m=viewcat&c=42