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# Policy
A policy is a predicate that describes if a subject can perform an action
against a specific resource.
```ruby
policy(:parent) { predicate }
policy(:partner) { predicate }
policy(:sibling) { predicate }
policy(:child) { predicate }
enable(:permission, on: resource).when { parent | partner }
```
Authorizaion uses policies to determine if a subject in a specific context is
authorized to perform an action against a resource.
```ruby
def can?(subject, action, resource)
end
```
## Policy Language
A policy language facilitates:
1. the specification of composite policies, which in turn forms the basis of trust delegation.
1. **the static analysis of policies and system configuration.**
## Example
The following hierarchy will be used as the basis for expression policy.
```ruby
class Organization
has_many :groups
end
class Group
belongs_to :organization
has_many :projects
end
class Project
belongs_to :group
has_many :issues
end
class Issue
end
```
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