[ARIA-119] Syntax for executing a relationship operation on a specific edge (source/target)

• Type: Story
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Assignee: Unassigned
• Reporter: Ran Ziv
• Created: 09/Mar/17 10:09
• Updated: 19/May/17 09:20

Description

TOSCA doesn't define a syntax for specifying which edge (source/target) of the relationship a relationship operation should run on. At the moment, this will be determined by the workflow author.
We could provided a syntax where the `implementation` field value would also hold the information for the edge, e.g.:

implementation: script.sh @ SOURCE

SOURCE and TARGET are already familiar "TOSCA constants", and the implementation field already has special syntax using the "@" sign so this seems to make the most sense.