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Each node forms a branch of the tree and defines a condition. Nodes can define either operators or operands.

Operand nodes store the offset of field names or constants within the Literal Pool Area. The values are stored in the literal pool. A field node points to the offset location of a field name containing a literal, that is, the actual character string of the field name, which must be zero-terminated. A constant node points to a constant value within the literal pool.

Operator nodes are of different types:

•Relational

•Logical

•Arithmetic

•Miscellaneous

 

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