# Attribute Release Policy - Return Mapped

Source: https://apereo.github.io/cas/development/integration/Attribute-Release-Policy-ReturnMapped.html

This policy will return a collection of allowed principal attributes for the service, but also allows those principal attributes to be mapped and “renamed” at the more granular service level.

For example, the following configuration will recognize the resolved attributes `eduPersonAffiliation` and `groupMembership` and will then release `affiliation` and `group` to the web application configured.

```json
{
  "@class" : "org.apereo.cas.services.CasRegisteredService",
  "serviceId" : "sample",
  "name" : "sample",
  "id" : 300,
  "description" : "sample",
  "attributeReleasePolicy" : {
    "@class" : "org.apereo.cas.services.ReturnMappedAttributeReleasePolicy",
    "allowedAttributes" : {
      "@class" : "java.util.TreeMap",
      "eduPersonAffiliation" : "affiliation",
      "groupMembership" : "group"
    }
  }
}
```

Attributes authorized and allowed for release by this policy may not necessarily be available as resolved principal attributes and can be resolved on the fly dynamically using the [attribute definition store](https://apereo.github.io/cas/development/integration/Attribute-Definitions.html).