220.127.116.11.2 Collection of Complex Type Instances
A collection of ComplexType instances MUST be represented in XML as a single XML document with the root element of the document equal to the same name of the service operation returning the ComplexType instances. The root element and all its child elements MUST exist in the Data Service Metadata namespace, as specified in Common Serialization Rules for XML-based Formats (section 18.104.22.168).
Each ComplexType instance in the collection must be represented as a child element of the root element and be named "element". An attribute named "type" (in the Data Service Metadata namespace, as described in Common Serialization Rules for XML-based Formats (section 22.214.171.124), MUST exist on the element. The value of this attribute MUST specify the namespace qualified type name of the ComplexType.