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The ElementOperand provides the linking to sub-elements within a ContentFilter. The link is in the form of an integer that is used to index into the array of elements contained in the ContentFilter. An index is considered valid if its value is greater than the element index it is part of and it does not Reference a non-existent element. Clients shall construct filters in this way to avoid circular and invalid References. Servers should protect against invalid indexes by verifying the index prior to using it.

Table 127 defines the ElementOperand type.

Table 127 – ElementOperand

Name	Type	Description
ElementOperand	structure	ElementOperand value.
index	UInt32	Index into the element array.