<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def is_provided(self, name):
 """ Capability check if evaluator provides given value """

        if name in self._storage:
            return True
        elif name in self._providers:
            return True
        elif name.startswith('rollout:'):
            rollout_name = name[8:]
        else:
            return False