Model-Based Systems Engineering with OPM and SysML by Dov Dori

Author:Dov Dori
Language: eng
Format: epub
Publisher: Springer New York, New York, NY

The OPD on the right of Fig. 14.4 demonstrates that a structural relation can exist also between two processes. As the OPL sentences in Fig. 14.4 demonstrate, the syntax of a tagged structural OPL sentence is a simple concatenation of the source thing followed by the tag, followed by the destination thing. The tag is non-capitalized and is in bold Arial letters since it is user-defined rather than a reserved phrase.

14.1.5 Bidirectional Tagged Structural Link

The tagged structural relations and links defined and exemplified so far have been unidirectional. The tag is therefore a forward tag —a tag from the source thing to the destination thing. As discussed, for any tagged structural relation (and its graphical representation as a link) there is a corresponding tagged structural relation (and link) in the opposite direction, expressed by a backward tag —a tag from the destination thing to the source thing. We can express the two relations in a single bidirectional tagged structural link.

A bidirectional tagged structural link is a combination of two tagged structural links in opposite directions.

The bidirectional structural link is depicted as a harpoon-shaped arrow , , which links the two things. The tags of the relation in one direction and in the other direction are recorded such that the harpoon edges sticking out of the arrowheads unambiguously determine the direction in which each relation holds, as Fig. 14.5 demonstrates. The harpoon points to the destination thing. Consider the OPD on the left of Fig. 14.5, where the objects Highway and Underwater Tunnel are linked with a bidirectional tagged structural relation. The tag from Highway to Underwater Tunnel is “passes through”, while the one in the opposite direction is “provides for shortening the”. Similarly, in the OPD on the right of Fig. 14.5, the processes Manufacturing and Testing are linked with a bidirectional tagged structural relation, where the two tags are “involves” and “is embedded in”.

Fig. 14.5Highway and Underwater Tunnel are linked with a bidirectional tagged structural relation

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