Lifeline going through reference blocks

[RandiT]

So I am fairly new to SysML and EA. We currently have an issue in many of our sequence diagrams where we have a lifeline that go through reference blocks that it does not use. For example let say I have lifeline A, B, C (in that order) and I have Ref Block 1(on top), Ref Block 2(on bottom). Ref Block 1 uses life line A-C, where lifeline 2 uses A & C. The simple answer would be to re arrange these lifelines; however the diagrams are far more complex than my simple example.
So my questions are:
-Is there a way in EA to terminate a lifeline when only using a Ref block, not a message?
- Is there a way to place a lifeline in front of a ref block to show that it is not being used?
- Is there a SysML standard that states if a lifeline that goes through a ref block it must be used in the referenced diagram, or is it simply a type of convention?

[sargasso]

RandiT,

I'm not sure if this going to help here but I am replying to you statement that " the diagrams are far more complex than my simple example"

If so, then it might be an idea to examine the need for such diagrams.

I, myself, have been (in my youth, ahem, some time ago) caught trying to produce gestalt diagrams that were just too complex to :
1) complete
2) comprehend.

These days, I just hold to the precept that, if there are complexities in the diagram that confound the modeler, then just perhaps...


anyway, just thought
b