How to Trigger / execute a rule directly from an XML form?

Question

I am in the process of customizing User Forms, and I would like to implement a trigger (if that's the right name for it) in the XML script, which will execute a Rule (or some code) that will result in an email being sent.
For example, the following simple script (selection from a dropdown menu) :
*<Field name='orderlunch'>*
*<Display class='Select' action='true'>*
*<Property name='title' value='Order Lunch'/>*
*<Property name='allowedValues'>*
*<List>*
*<String>- Please Select -</String>*
*<String>Yes</String>*
*<String>No</String>*
*</List>*
*</Property>*
*</Display>*
*</Field>*
A small XML code, to indicate an order for lunch.
naturally, if the user selects "No", then nothing happens.
But, if he selects "Yes", then I would like to automatically send an Email Notification to the appropriate person, notifying him that lunch has been ordered. (of course, I would need to indicate such things as WHO ordered the lunch, WHEN, etc, etc. But, I will get into that later)
Does anyone know how this can be done?
(a) Could I insert the trigger/condition/whatever right into the main XML script itself?
Or
(b) should I write a code which will call on/invoke a separate Rule, which will subsequently send the email?
If (b) is the right answer, then how would I go about creating such a Rule, and linking it to the main XML script?

Answer 1

In your Wf or subprocess call the activity notify .testemaillist contains the list of users for whom the mail need to be sent .
<Activity id='1' name='Notify'>
<Action id='0' process='Notify'>
<Iterate for='email' in='testEmaillist'/>
<Argument name='template' value='emailtemplatename'/>
<Argument name='to' value='$(email)'/>
</Action>
</Activity>
I hope this may help you