# Logical expressions used in OSQL and Form
[Core classes]

Collaboration diagram for Logical expressions used in OSQL and Form:

## Classes

class | BinaryExpression
class | EqualsLowerExpression
class | Expression
| Factory for various childs of LogicalObjects. More...
class | HstoreExpression
class | InExpression
| Name says it all. More...
class | LogicalBetween
| SQL's BETWEEN or logical check whether value in-between given limits. More...
class | LogicalChain
| Wrapper around given childs of LogicalObject with custom logic-glue's. More...
interface | LogicalObject
| Support interface for Form's logic rules. More...
class | LTreeExpression
| Extensive facilities for searching through label trees are provided. More...
interface | MappableObject
class | PostfixUnaryExpression
class | PrefixUnaryExpression