Check if an entered e-mail address is unique, by looking in the m_identity table for the email key:

<input type="text" id="email" name="email" value="" />
{% validate id="email" type={email} type={email_unique} %}

Optionally, an rsc_id parameter can be given to the validator to skip that particular id when doing the uniqueness check. This is useful when you are displaying a form in which the user is editing his own email address.

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