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One-to-one mapping in hibernate

 
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In the above code we perform one-to-one mapping using <many-to-one> by setting unique="true". There is also a <one-to-one> tag. Could anyone explain me why <many-to-one> tag is used for one-to-one mapping even if <one-to-one> tag exists ?
I tried using <one-to-one> tag but there is no 'column' attribute in <one-to-one> tag
 
Akshayyha Krishnamurthy
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Hey people.. I've tried using <one-to-one> tag. it worked when used like this:

But didn't work when used as :

Because, <one-to-one> tag doesn't have column attribute
I tried other mappings too and I found these :
<one-to-one> doesn't have column attribute
<one-to-many> doesn't have both name and column attributes
<many-to-one> has both name and column attributes
<many-to-many> doesn't have name attribute

Could someone explain to me why its so?
 
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