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Sequence
A value of sequence specified for the property string of an association end indicates that the collection of instances are an ordered bag. This means that the collection is ordered but can contain duplicated instances. It does not specify the basis for the order.
Explanation
A sequence is an ordered collection of elements that can contain the same element any number of times. An association relates an instance at one end to a number (collection) of instances at the other. The default value for this property is 'set' which adopts its mathematical meaning that elements can only appear once and are unordered. Specifying sequence for this property overrides this default value and specifies that the instances must be ordered. The value of sequence implies the collection is a bag.
