LOGCON

FEATURE OBJECT ATTRIBUTES

Attribute: Logical connectives

Acronym: LOGCON Code: ?

Camel case: logicalConnectives

Attribute type: Enumeration

Definition: Expresses whether all the constraints described by its co-attributes must be satisfied, or only one such constraint need be satisfied.

Attribute values:

1 logical conjunction

2 logical disjunction

Definitions:

logical conjunction

all the conditions described by the other attributes of the object, or sub-attributes of the same complex attribute, are true

logical disjunction

at least one of the conditions described by the other attributes of the object, or sub-attributes of the same complex attributes, is true

Remark:

• This atribute is intended to be used with co-attributes that encode limits on vessel dimensions, type of cargo, and other characteristics.
• The combination of constraints described by logicalConnective and its co-attributes defines a subset of vessels to which information described by a feature or information type instance applies (or does not apply, is required, recommended, etc.).
• The relationship between the vessel subset and the information is indicated by an association - see PermissionType and InclusionType).
• The two listed values of logicalConnective are two of the basic operations of Boolean logic. The third basic operation (not) is not used.

Example:
applicabilty
logicalConnectives=1
vesselsMeasurements [vesselsCharacteristics=10/vesselsCharacteristicsValue=50.0/ComparisonOperator=1]
vesselsMeasurements [vesselsCharacteristics=6/vesselsCharacteristicsValue=10.0/ComparisonOperator=1]

implies the limitation applies only when LOA > 50.0 and draught > 10.0

Distinction:

Nil

Justification:

New attribute

Comments:

No comments.

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David	Raphael	Jens
Y	Y	Y