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what is metadata means ?

Alvin chew
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Joined: Jan 08, 2004
Posts: 834
hi, can anyone explain what is metadata means ? tq
fred rosenberger
lowercase baba

Joined: Oct 02, 2003
Posts: 11143

I'm not positive, but I think it's data about your data. Say you've done some surveys. you have a bunch of people answering a question. Their answers are your data.
but when you start saying "i have 500 responses, and a 95% certainty that my results are accurate to within +/-3% accuracy...
THOSE numbers are meta-data.

There are only two hard things in computer science: cache invalidation, naming things, and off-by-one errors
Dirk Schreckmann

Joined: Dec 10, 2001
Posts: 7023
fred's explanation is a good one.
Metadata is descriptive information about information.

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Alvin chew
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Joined: Jan 08, 2004
Posts: 834
if metadata of database ? then ?
Jeroen Wenting
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Joined: Oct 12, 2000
Posts: 5093
the metadata is the data that defines your data.
In the context of a database it would be the table definitions and things like that.

Dirk Schreckmann

Joined: Dec 10, 2001
Posts: 7023
The term metadata is used to label information that describes information in the database world, as well as in other situations.
Note that Java 1.5 is scheduled to include a metadata facility to allow classes, interfaces, fields, and methods to be marked as having particular attributes.
Consider Paul's rocket mass heater.
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