3.1.4.1.26 Arrays
The WS-CIM Mapping Specification defines specific rules for mapping CIM properties that are arrays. Additional information is specified in [DMTF-DSP0230] section 9.2.2.
Web Services Management Protocol Extensions for Windows Vista servers MUST NOT send null array elements. Web Services Management Protocol Extensions for Windows Vista servers MUST indicate null arrays by including the element once with the xsi:nil attribute set to "true".