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One of the ways to organize SEF in components 2.0 consists in using the ErrorDocument option. There is a standard solution for components 2.0 which permits not to worry about the option used for SEF support, be it ErrorDocument or mod_rewrite.
When writing forms in component templates which send data using the POST method the constant POST_FORM_ACTION_URI must be indicated as action:
In this case, when working with the ErrorDocument option, a POST query will be sent to a script that exists physically, and in other cases – to a current address. It will make no difference for a component as to whether it was called by a POST or a GET query. All the required variables will be set up accordingly.