3.1.4.5.3.2 OrderBy Format
The OrderBy clause MUST be well-formed XML as defined by the XSD in [MS-WSSCAML]. The OrderBy clause specifies the order of the list items in the response by identifying the names of certain fields.
An example of an OrderBy clause is as follows:
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<OrderBy > <FieldRef Name='ID'> </FieldRef> <FieldRef Name='Title' Ascending='False'> </FieldRef> </OrderBy>
The OrderBy clause contains a FieldRef element which MUST refer to a valid field name. Valid field names are provided in the Name attribute of the _sProperty element (section 3.1.4.3.3.3) returned from the GetList operation. The Ascending attribute is optional and indicates ascending order if value is true, or descending otherwise. By default, Ascending is true.