ISO 10303-214:2010(E)
A Specification_expression is a combination of Specification objects formed by Boolean operations.
The data associated with a Specification_expression are the following:
The description specifies additional information about the Specification_expression.
See specification_expression to multi_language_string for the application assertion.
The description need not be specified for a particular Specification_expression.
If present, there shall be exactly one object that defines the description for a Specification_expression.
The id specifies the identifier of the Specification_expression.
The id need not be specified for a particular Specification_expression.
The operand specifies the operands of the Boolean operation that are either Specification objects or other Specification_expression objects. In case operation is 'not' there shall be exactly one operand.
See specification_expression to specification and specification_expression to specification_expression for the application assertions.
There shall be at least one object that defines the operand for a Specification_expression.
The operation specifies the kind of Boolean operation. Four kinds of operations are permitted:
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