validation using xforms:bind

> Hi,
>
>   Iam validating the controls using xforms:bind. But when iam using
> constraint attribute with any particular constraint, iam getting error
> values.
> sample program:
>
>  <form>
>      <sample>
>            <firstname/>
>            <lastname/>
>      </sample>
> </form>-----------
> <xforms:bind ref="sample">
> <xforms:bind nodeset="firstname" type="xs:string" required="true()"
> constraint="matches(.,'[A-Za-z]{6,15}')"/>
>
> </xforms:bind>
>
> The other problem is, I want to display any alert or message to the user
> when the user enters the invalid values. I tried to use <xforms:alert/>, but
> the problem is not solved yet.
>
>
>
>
>
> -----
> Regards
> Satya K
>
>
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