Format of the Condensed Log

Each line of a condensed log corresponds to a single URL requested by
the user; it contains the machine name, the time stamp when the request
was made (seconds and microseconds since January 1, 1970), the URL, the 
size of the document (including the overhead of the protocol) and the
object retrieval time in seconds (reflecting only actual communication time,
and not including the intermediate processing performed by Mosaic in a
multi-connection transfer).  An example of a line from a condensed log
is: 

cs20 785526142 920156 "http://cs-www.bu.edu/lib/pics/bu-logo.gif" 1804 0.484092

In the condensed logs, lines with the number of bytes equal
to 0 and retrieval delay equal to 0.0 mean that the request was
satisfied by Mosaic's internal cache.

Format of the Window History Log

The second log file reports the window context of the user
when using the browser, i.e., the sequence of documents visited
and the windows in which those documents are visited.    This tracks
behavior such as going ``forward'' or ``backwards''
within a window, or ``jumps'' between windows.  

Each line in this file contains: a two digit number
separated by a dot, reflecting the window and the document number inside
that window; the URL; and the date/time when it was accessed.  Here is
an example of four lines from a window history log:

1.1 "http://cs-www.bu.edu:80/" "Tue Nov 22 12:42:24 1994"
1.2 "http://www.zyxel.com/" "Tue Nov 22 12:46:42 1994"
1.3 "http://www.zyxel.com/2864.html" "Tue Nov 22 12:48:21 1994"
1.2 "http://www.zyxel.com/" "Tue Nov 22 12:53:33 1994"

Format of the Document Structure Log

The third log file contains a structural summary
of each of the documents viewed by the user.   
For each document visited, the log contains a summary of the embedded
images (<IMG SRC=...>) and the embedded references (<A HREF=...></A>).   

The type of a line in the document structure log is identified by a
number in the first position on the line.  The number 1 signifies that
the line is a URL directly requested by the user.  Subsequent lines
specify items contained in that URL, continuing until another line type
1 is encountered.  The number 2 signifies that the
line represents a contained URL, normally an in-line image. The number 3
means that the line represents a reference (anchor).  The number 4 is
used to indicate that the line represents a redirection;
what follows is the redirected URL.

Lines in the document structure log consist of two formats.
For type 1 and 2 lines, the format is: the line type;  the
machine name; the URL; seconds and microseconds since 1/1/70 when the
request was made; the round trip retrieval 
time; and the item's size (including the protocol overhead).  
If the object's size and time are zeroes, no transfer took place, possibly
because the objest was shared by other documents.
For type 3 lines, the format is: the line type; the sequence number of
the reference within the document (numbered sequentially starting from
0 for each document); and the reference itself.  

Sometimes Mosaic is not able to fetch parts of the whole document; for
example, some in-line images.  This is indicated in the document
structure log by the absence of the time and size information.