The ContentFilter structure specified in 7.7 defines a collection of elements that makes up filter criteria and contains different types of FilterOperands. The FilterOperand parameter is an extensible parameter. This parameter is defined in Table 129. The ExtensibleParameter type is defined in 7.17.
Table 129 – FilterOperand parameter TypeIds
|
Symbolic Id |
Description |
|
Element |
Specifies an index into the array of elements. This type is used to build a logic tree of sub-elements by linking the operand of one element to a sub-element. |
|
Literal |
Specifies a literal value. |
|
Attribute |
Specifies any Attribute of an Object or Variable Node using a Node in the type system and relative path constructed from ReferenceTypes and BrowseNames. |
|
SimpleAttribute |
Specifies any Attribute of an Object or Variable Node using a TypeDefinition and a relative path constructed from BrowseNames. |