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<p>Arguments create a context from external input, which is assumed to be a string as though it came from a URL element.</p>

<pre>'title' => title

    'description' => Description

    'keyword' => Default keyword for the context

    'context' => Callback to create the context. Params: $arg = NULL, $conf = NULL, $empty = FALSE

    'default' => either an array of default settings or a string which is a callback or null to not use.

    'settings form' => params: $form, $form_state, $conf -- gets the whole form. Should put anything it wants to keep automatically in $form['settings']

    'settings form validate' => params: $form, $form_state

    'settings form submit' => params: $form, $form_state

    'criteria form' => params: $form, &$form_state, $conf, $argument, $id -- gets the whole argument. It should only put form widgets in $form[$id]. $conf may not be properly initialized so always guard against this due to arguments being changed and handlers not being updated to match.

    + submit + validate

    'criteria select' => returns true if the selected criteria matches the context. params: $context, $conf

</pre>