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CVu Journal Vol 13, #1 - Feb 2001
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Title: Your Letters - The Editor's Replies

Author: 

Date: 03 February 2001 13:15:43 +00:00 or Sat, 03 February 2001 13:15:43 +00:00

Summary: 

Some Corrections

Body: 

Dear Francis,

I made a mistake in my article about ED. The "wq" command is only present in some (usually GNU) versions of ED; usually "w" and "q" are separate commands.

In response to my piece about Cocoon, one reader commented that Cocoon is not a Web server but a Java servlet. I did not mean to say that it was a Web server, but perhaps I implied the wrong thing by saying that it was slow "for a Web server". I was also wrong to complain about case sensitivity, since that is the XML standard.

Also, I am sorry about the confusion over GUIDs. Perhaps I misunderstood the employee of Microsoft Research whose talk I went to; I thought he said that IP addresses were used. If they are IEEE 802.1 node addresses then duplication is less likely and will only happen in situations like the following:

  1. We run out of 48-bit node addresses, or a manufacturer re-uses its allocation (I'm told this has happened);

  2. GUIDs are generated faster than the timestamp changes, perhaps by two separate applications running on the same machine at the same time (although the inclusion of process ID and/or a counter would solve that);

  3. The clock is set back, or the network card is swapped with one that had been in a machine with a clock that was ahead;

  4. No network card is visible, and the "cryptographic quality" 47-bit numbers collide more often in practise than in theory.

Best wishes Silas S. Brown

Notes: 

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