[p4] Better understanding of +/- client spec syntax

[Steven W. Orr]

A while ago I asked a clientspec question, but I want to ask a new one of 
a more general nature. I'm trying to understand the +/- usage.

Given multiple view lines in a clientspec with destination files mapped 
from multiple sources, the last line is the winner. I get that part. I 
like it and it makes sense.


MINUS SIGNS
I can use the "-" to prevent something from being selected. That's fine 
with me.
1. Is the "-" of use if I'm depending on multiple mappings? IOW, if I 
expect a file to be created and it could come from more than one place, is 
there value in deselecting it from where I don't want it even though I get 
it from the later match?

Here's a contrived example:
//depot/a/b/...        /view/a/b/...
-//depot/a/b/c         /view/a/b/c
//depot/x/y/c          /view/a/b/c

Is the deselected line of any use?

2. Is the right hand side of a "-" a dummy or does it have any value at 
all?

PLUS SIGNS
I have no idea what the value of "+" is. If I specify a plus sign to 
override something that was previously selected earlier, then it would 
have been picked off anyways.

//depot/a/b/...        /view/a/b/...
+//depot/x/y/c          /view/a/b/c

Does someone have an example of a plus usage that makes sense?

TIA

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