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ST_BoolOperator (Boolean Constraint)
This simple type specified Boolean operations which can be applied to compare constraints.
This simple type's contents are a restriction of the XML Schema token datatype.
The following are possible enumeration values for this type:
| Enumeration Value | Description | 
| equ (Equal) | Equal operator. | 
| gte (Greater Than or Equal to) | Specifies the greater than or equal to Boolean operator. | 
| lte (Less Than or Equal to) | Specifies the less than or equal to Boolean operator. | 
| none (None) | Specifies a none Boolean operator | 
| Referenced By | 
| constr@op (§5.9.2.8) | 
The following XML Schema fragment defines the contents of this simple type:
<simpleType name="ST_BoolOperator" final="restriction">
<restriction base="xsd:token">
<enumeration value="none"/>
<enumeration value="equ"/>
<enumeration value="gte"/>
<enumeration value="lte"/>
</restriction>
</simpleType>