Assigning a resource via a role

Question

I have a read only resource that is being assigned via a role. If the user, being assigned the role, exists in the resource then link the user to the resource and update 1 resoruce attribute. If the user, being assigned the role, does not exist in then do something else.
I've tried adding various resource attribute but without any success.
What's the best way to achieve this?
I'm using:
siebel crm adapter
idm 8.0
cheers
ck

Answer 1

Thanks for the replies.
I sorted this problem by checking <ref>waveset.roleInfos[*].name</ref> contained the required list of roles. If this condition was satisfied I then called a rule that called a static method that checked that the account existed. If the account existed then the following attributes were set:
<Field name='waveset.accounts[ResourceName].created'>
<Default>
<s>true</s>
</Default>
</Field>
<Field name='waveset.accounts[ResourceName].identity'>
<Default>
<ref>global.accountId</ref>
</Default>
</Field>
<Field name='waveset.accounts[ResourceName].accountId'>
<Default>
<ref>global.accountId</ref>
</Default>
</Field>
Thanks again