db that match exactly the a list of pairs (tag, exact_pattern). The exact_pattern is a string and the tah can be any tag supported by MPD, or one of the special parameters:</p><ul><li>any checks all tag values</li><li>file checks the full path (relative to the music directory)</li><li>base restricts the search to songs in the given directory (also relative to the music directory)</li><li>modified-since compares the file's time stamp with the given value (ISO 8601 or UNIX time stamp)</li></ul></dd></dl><dl><