Currently errors from pipeline JSON to PMD are returned in a textual way that makes it awkward for tools to consume them and display appropriate contextual errors, for example:

At /pipeline/stages/1/branches/0/steps: Array has 0 entries, requires minimum of 1

It would be helpful if these errors were split somehow into a location and message, e.g.:

{ location: '/pipeline/stages/1/branches/0/steps', message: 'Array has 0 entries, requires minimum of 1' }

or even:

{ location: [ 'pipeline', 'stages', 1, 'branches', 0, 'steps' ], code: 'EMPTY_ARRAY_NOT_ALLOWED', message: 'Array has 0 entries, requires minimum of 1' }

Or maybe something different.

This would make it easier for tools to consume without having to parse a potentially volatile (and localized) text format.