A Variant value is encoded as an xs:complexTypewith the following XML schema:

<xs:complexType name="Variant">

<xs:sequence>

<xs:element name="Value" minOccurs="0" nillable="true">

<xs:complexType>

<xs:sequence>

<xs:any minOccurs="0" processContents="lax"/>

</xs:sequence>

</xs:complexType>

</xs:element>

</xs:sequence>

</xs:complexType>

If the Variantrepresents a scalar value, then it shall contain a single child element with the name of the built-in type. For example, the single precision floating point value 3,141 5 would be encoded as:

<tns:Float>3.1415</tns:Float>

If the Variantrepresents a single dimensional array, then it shall contain a single child element with the prefix 'ListOf' and the name built-in type. For example, an Arrayof strings would be encoded as:

<tns:ListOfString>

<tns:String>Hello</tns:String>

<tns:String>World</tns:String>

</tns:ListOfString>

If the Variantrepresents a multidimensional Array,then it shall contain a child element with the name ‘Matrix’with the two sub-elements shown in this example:

<tns:Matrix>

<tns:Dimensions>

<tns:Int32>2</tns:Int32>

<tns:Int32>2</tns:Int32>

</tns:Dimensions>

<tns:Elements>

<tns:String>A</tns:String>

<tns:String>B</tns:String>

<tns:String>C</tns:String>

<tns:String>D</tns:String>

</tns:Elements>

</tns:Matrix>

In this example, the array has the following elements:

[0,0] = "A"; [0,1] = "B"; [1,0] = "C"; [1,1] = "D"

The elements of a multi-dimensional Arrayare always flattened into a single dimensional Arraywhere the higher rank dimensions are serialized first. This single dimensional Arrayis encoded as a child of the ‘Elements’ element. The ‘Dimensions’ element is an Arrayof Int32values that specify the dimensions of the array starting with the lowest rank dimension. The multi-dimensional Arraycan be reconstructed by using the dimensions encoded. All dimensions shall be specified and shall be greater than zero. If the dimensions are inconsistent with the number of elements in the array, then the decoder shall stop and raise a Bad_DecodingError.

The complete set of built-in type names is found in Table 1.