Designing and Implementing Business Process Models : ARIS Method manual : Modeling within the views and levels of the ARIS concept : Data view : Requirements definition : Document type definition : Connection types
Connection types
Assignments in the content of an element type can occur with varying frequency. The number of permitted occurrences of an assignment in the content of the element type is determined by the connection type between element type and assignment.
The following connection types are available:
*has any number of times
*has at least once
*has at most once
*has exactly once
The following table explains the various connection types and the corresponding character that is used in the generated DTD to symbolize their occurrence:
Connection type
Description
Character
has any number of times
The assignment must not necessarily occur in the content of the element type being described. It may occur once or multiple times (min = 0, max = any positive integer).
*
has at least once
The assignment must occur in the content of the element type being described and it may occur more than once (min = 1, max = any positive integer).
+
has at most once
The assignment must not necessarily occur in the content of the element type being described. It may occur only once (min = 0, max = 1).
?
has exactly once
The assignment must occur in the content of the element type being described. It may occur only once (min = 1, max = 1).
no character
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