220.127.116.11.3.21.3 Child Elements
Body: The expression to evaluate, the type of this element is ExpressionType as specified in section 18.104.22.168.3.24.
Object: The set of child CSOM Objects to filter.
Parameter: The input parameter in the expression. Inside the expression Body element, when the input parameter is referenced by an element whose type is ExpressionParameterExpressionType, as specified in section 22.214.171.124.3.16, and whose name attribute is same as the name of the input parameter, the value of the input parameter is the child object in the set of CSOM Objects that are returned from an inner queryable expression.