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Meaning of ? in web.xml DTD

 
Jay DasPurkayastha
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Hello all:
Can anyone clarify the meaning of this notion--? used in the specification of many tags in the web.xml DTD? For Example, login-config (auth-method?, realm-name?, form-login-config?)
I know that:
* means optional and 0 or more can be present
+ means mandatory and 1 or more can be present
<nothing> as in web-resource-collection (web-resource-name, ...) means only 1 can be present.
Please correct me if I am wrong in any of the above.
Thanks in Advance,
Jay
 
Aleks Pascoal
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Hey,
? means 0 ou 1.
Aleks
 
Jay DasPurkayastha
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Thanks a lot Aleks. Thats very helpful.
 
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