Back in February, I wrote a blog post about how we can use the XBRL Object in Legato to do some extra validation on XBRL. In that blog we added a check for the number of custom elements. That was a relatively basic application of XBRL in Legato though, not very complicated. What if we want to do something a lot more in depth? For example, check to ensure we’re not defining any cyclic presentation relationships. By that, I mean that you have a dimension - member pair in a context, but in the presentation properties for a presentation where that context appears the domain for that dimension is set to the same member. That’s a cyclic relationship; saying something is it’s own parent element. This isn’t Futurama, you can’t be your own grandfather in XBRL.