Thank you for your replies. 
other question : why we distinguishe these two attributes include="nonpk"
and  include="pk"; in the implementation of a service i never found this
distinction when manipulating IN parameters.

jonwimp wrote:
> 
> Not sure if <attribute> overrides an <auto-attributes>. There's
> <override>.
> 
> In <auto-attributes>, there's also <exclude>, so you can selectively
> exclude some attributes in 
> the entity specified in <auto-attributes entity-name="SomeEntity">.
> 
> Usually, you'll use <override> to override the "optional" attribute of an
> attribute. For eg,
> 
>    <auto-attributes entity-name="SomeEntity" include="pk"
> optional="false"/>
>    <override name="somePkInSomeEntity" optional="true"/>
> 
> I skipped several attributes in the above eg.
> 
> Jonathon
> 
> Amine AZZI wrote:
>> it's a shortcut, instead of declaring each attribute apart, you can use
>> this
>> tag to generate all attributes with default values taken from the entity
>> model definition of the used entity.
>> Of course, you can override this declaration by declaring an existing
>> attribute.
>> 
>> Regards.
>> Amine.
>> 
>> 2007/10/3, sqlien <[EMAIL PROTECTED]>:
>>>
>>> hi,
>>>
>>> Can anyone tell me what mean these two lines in services.xml files
>>>
>>> <auto-attributes mode="IN" include="pk" optional="false"/>
>>> <auto-attributes mode="IN" include="nonpk" optional="true"/>
>>>
>>> why we use them ?
>>>
>>> thanks
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>>>
>>>
>> 
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> 
> 
> 

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