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  1. OMG Issue

SYSML12 — Ambigous line crossings

  • Key: SYSML12-11
  • Legacy Issue Number: 13190
  • Status: closed  
  • Source: INCOSE ( Sanford Friedenthal)
  • Summary:

    Issue: Ambigous line crossings Discussion: When two lines cross, there can be ambiguity associated with the line path. This applies to any line including flows, associations, and connectors and other relationships represented by edges. A solution to remove ambiguity that is used in various schematic diagrams to address the same issue is to add include a curve in the lline path at the intersection. Proposed Resolution: In the Diagram Appendix on pgs 175-176, and a diagram guideline to include the curve to a crossing line path to avoid ambiguity. Consider making this a normative requirement. This will require an additional clarification statement for the Non Normative annexes.

  • Reported: SysML 1.1 — Tue, 23 Dec 2008 05:00 GMT
  • Disposition: Resolved — SysML 1.2
  • Disposition Summary:

    Update the Guidelines in the Diagram Annex in Section A.2 to include an
    alternative. ”jumping over “ notation for line crossings to avoid ambiguity, similar
    to what has been used in electrical schematics. This is indicated by a small
    semicircle at the line crossing. This can be applied to any edge in any SysML
    diagram including flows, associations, connectors, and other relationships. It
    should be noted that this is currently a presentation option for UML associations
    as specified in the UML Superstructure specification (formal/09-02-02 pg 43).

  • Updated: Fri, 6 Mar 2015 20:58 GMT