| Globally Unique IDs (GUIDs) [message #1025] |
Mon, 05 April 2004 11:00  |
Nils Poldrack
Messages: 14
Registered: April 2004
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Junior Member |
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Hello,
Joachim Buechse from Ergon (CH) suggested on 2003-09-25 to use globally
unique
identifier for railML elements. He suggested to use the IP of the
creating computer concatenated with the milliseconds (e.g. since
1970-01-01).
In my "Instructions how to build a railML scheme" I adopted this proposal.
IPv4 and IPv6 create different spaces for their GUIDs.
Advantages of Joachim's proposal are:
- IP is easy to determine.
- The milliseconds since 1970-01-01 are easy to determine.
- There is not force to convert IPv4 to IPv6 or to pad the length.
- The saving format doesn't matter: HEX or Base64.
Disadvantages of Joachim's proposal are:
- No anonymity: via static IP it's possible to find the creator of the GUID.
- Not every computer has got an IP.
Ulrich Linder made the suggestion to use the MAC instead of the IP:
there is anonymity and (almost) every PC has a network card and so a
MAC. (I don't know how to read the MAC - but this is a problem of the
software engineer.)
Please write me your opinion. I prefer Joachim's GUID but using MAC
instead of IP. Thank you there much for your statement.
Nils Poldrack
IVI Dresden
PS. Sorry for my "rusty" English.
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