`TFPExprVariable`
		Check
		AsString

`TFPExprIdentifierNode`
		CreateIdentifier
		NodeType
		GetNodeValue

`TFPExprNode`
pt		CheckNodeType
pt		GetNodeValue
		Check
		InitAggregate
		UpdateAggregate
		IsAggregate
		HasAggregate
		NodeType
		NodeValue
		AsString