Can someone here explain what the output of "mminfo -aXv -c" means?

For example, suppose I get back something like:

==============
Information for agingw2ksrv.temple as of /usr/bin/date
 Save Set Type Summary:
   789 save sets      766814 files   972/ss   102 GB   130 MB/ss   134 KB/file
   479 full           736303 files  1537/ss    98 GB   205 MB/ss   133 KB/file
   310 incremental     30511 files    98/ss  4251 MB    13 MB/ss   139 KB/file
     0 intermediate
     0 ad-hoc
     0 archive
     0 migration
    50 empty
   129 purged         110531 files   857/ss    14 GB   115 MB/ss   135 KB/file
     0 index
    10 incomplete      35297 files  3529/ss  4502 MB   450 MB/ss   127 KB/file

   6% of full files per incremental
  86% of files are on-line

 Recent Save Set Usage Summary:
     0 today
     4  9/25/03          232 files    58/ss    25 MB  6498 KB/ss   112 KB/file
     4  9/24/03          392 files    98/ss    49 MB    12 MB/ss   125 KB/file
     7  9/23/03        35219 files  5031/ss  4631 MB   661 MB/ss   131 KB/file
     4  9/22/03          267 files    67/ss   105 MB    26 MB/ss   396 KB/file
     4  9/21/03          227 files    57/ss    22 MB  5714 KB/ss   100 KB/file
     4  9/20/03          227 files    57/ss    21 MB  5419 KB/ss    95 KB/file
    27 one week        36564 files  1354/ss  4856 MB   179 MB/ss   133 KB/file
   130 one month      151643 files  1166/ss    20 GB   157 MB/ss   135 KB/file
=====================

In the top portion of the report, what do the "50 empty" mean? What does
the "purged" row mean? and what about the "incomplete" row?

This is with NetWorker 6.1.3 on a Sun Solaris 9 system.

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