PDS_VERSION_ID                   = PDS3                                       
                                                                              
RECORD_TYPE                      = STREAM                                     
                                                                              
 OBJECT                           = TEXT                                      
  PUBLICATION_DATE               = 2015-03-27                                 
  NOTE                           = "Description of the INDEX                  
                                   directory contents."                       
END_OBJECT                       = TEXT                                       
END                                                                           
                                                                              
                    INDEX Directory Contents                                  
                                                                              
The INDEX directory contains tabular index files describing the               
content of the data set.  Each tabular index is accompanied by                
a detached PDS label.  The index files present depend upon the                
files in the data set.                                                        
                                                                              
Required files present in all data sets:                                      
---------------------------------------                                       
                                                                              
INDXINFO.TXT - The file you are reading.                                      
                                                                              
INDEX.TAB     - Main INDEX table listing all label files                      
                                                                              
INDEX.LBL     - PDS Label for the main INDEX table                            
                                                                              
    N.B. The INDEX.TAB file contains columns for the                          
    RELEASE_ID and REVISION_ID.  This is a system                             
    used by the PSA to incrementally build up a data                          
    set and to provide a mechanism by which files can                         
    be updated without reconstructing the entire data                         
    set. The system is not used by all missions. For                          
    those missions not using the concept, a default                           
    value of RELEASE_ID=0001 REVISION_ID=0000                                 
    is used in the INDEX label and table.                                     
                                                                              
Optional files, depending on the content of the data set:                     
--------------------------------------------------------                      
BROWSE_INDEX.TAB     - INDEX table listing all label files in the BROWSE      
directory                                                                     
                                                                              
BROWSE_INDEX.LBL     - PDS Label for the BROWSE_INDEX table                   
                                                                              
GEO_XXXX.TAB  - Geometry and position index file, where                       
                   XXXX = the reference target used to compute the            
                   geometric parameters.                                      
                                                                              
GEO_XXXX.LBL  - PDS Label for the GEO_XXXX.TAB index file                     
                                                                              
Other index files can be defined by the data set developer to list            
products in their data set and to provide valuable information and            
relate various parameters to their data products. These are                   
individual to each data set.                                                  
                                                                              
                 Notes on Using the Index Tables                              
                 -------------------------------                              
     Each index table contains one row (record) for each data product         
on the volume.  The table is formatted so that it can be read directly        
into many data management systems.  All fields are separated by commas        
and character fields are enclosed in double quotation marks (").              
Character fields are left justified and numeric fields are right              
justified.  Each record ends with ASCII carriage return and line feed         
characters.  This allows the table to be treated as a fixed length            
record file on computers that support this file type and as a normal          
text file on other computers.                                                 
                                                                              
     The PDS label file for each table describes the content and              
structure of the fields in the index table.  This description includes        
the name of each field, its format, and a brief definition.  The              
values for start byte and number of bytes listed in the label file do         
not include commas between fields or quotation marks surrounding              
character fields.