******************************************************************************* Determine the first 'n' rows to be displayed for a particulra media type' choice is to be based on information collected in the media_display table.
******************************************************************************* get a single group of MARC tags from the tagGroup file as specified by the user.
******************************************************************************* gets groups of MARC tags from the tagGroup file and presents them to PHP as an associative array of display types.
******************************************************************************* cleans up a potential json string to meet JSON spec then call the decoder.
******************************************************************************* accepts a NNN$A formatted MARC tag and returns its components as an object.