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The selection mechanism to be used when deciding between multiple ad units attached to the placement
No selection mechanism.
The placement should use the weights assigned to each ad unit membership to pick an ad unit (using proabilistic picking).
The placement should rotate, in sequential order per user, the picked ad units.
The placement should pick ad units which perform better, based on their click-through rate.
<xs:element minOccurs="0" name="selection_mechanism_type"><xs:simpleType></xs:element><xs:restriction base="xs:string"></xs:simpleType><xs:enumeration value="none">
</xs:enumeration><xs:enumeration value="weighted">
</xs:enumeration><xs:enumeration value="rotated">
</xs:enumeration><xs:enumeration value="optimized"></xs:restriction>
</xs:enumeration>
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