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`core:ScopeAttribute`
=====================
A filter which combines two attributes into a scoped attribute.
That is, the value will be `something@scope`, usually to make it globally unique.
Parameters
----------
`scopeAttribute`
: The attribute that contains the scope.
: If the attribute contains a '@', we will take the scope from the part following the '@'.
Otherwise, we will use the entire value.
: If the attribute is multi-valued, we will add all the scopes to the target.
`sourceAttribute`
: The attribute that contains the values we shall add the scope to.
: This attribute can be multi-valued, in which case we will add all the values.
`targetAttribute`
: The attribute we shall add the scoped attributes to.
: If the attribute already exists, the new values will be merged into the existing attribute.
`onlyIfEmpty`
: Only replace the targetAttribute if it is empty to begin with.
: If `true`, then the targetAttribute will only be created if it didn't already contain values. Defaults to `false`.
: This is useful if, for instance, you want to create eduPersonScopedAffiliation from eduPersonAffiliation _only_ if eduPersonScopedAffiliation was not returned by the authenticaton source.
Example
-------
Add eduPersonScopedAffiliation based on eduPersonAffiliation and eduPersonPrincipalName.
10 => array(
'class' => 'core:ScopeAttribute',
'scopeAttribute' => 'eduPersonPrincipalName',
'sourceAttribute' => 'eduPersonAffiliation',
'targetAttribute' => 'eduPersonScopedAffiliation',
),
With values being `eduPersonPrincipalName`: `jdoe@example.edu` and
`eduPersonAffiliation`: `faculty`, this will result in the attribute
`eduPersonScopedAffiliation` with value `faculty@example.edu`.
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