BIML and MIST – a first encounter

The MIST developers – Varigence – have been waving their product at me for a wee while now and I’ve finally had a chance to get into the IDE and get a better feel for it.

Before I get too carried away, here’s a quick 101. There’s this thing called BIML – an XML dialect for describing BI Assets (for now, only in the Microsoft world). This opens the door to scripting and therefore simpler dynamic generation of BI objects. BIML can be used by BIDS Helper (a thing you should have if you are an active BI developer) or the more focused BIML IDE MIST.

Now, I’ve seen the shiny video that promised the world, but nothing quite beats hands on experience. So I’ve started following the online user guide and got as far as building a Dimension table.

My feelings so far? I’m a bit “meh”. Now I know there’s a lot more capability to the product which I haven’t got to yet – so this is far from final commentary – but there are a few clear things that I think need to be looked at in the product to give it the sense of really being a development accelerator.

First up, it’s pretty clunky. It suffers heavily from “kitchen sinkism” – i.e. because it can do something, there’s a dialog box / screen / tab for it displayed all at once. Take for example this table development screen:

MIST Table Development
MIST Table Development


There’s a lot going on and that’s on a 1920×1080 screen….   some better screen space organisation is needed.

Next up is the fact that the designers don’t add a lot over the basic SSMS  capability. The table designer there is effectively the same blank grid that you get in the SSMS table designer, but without even the courtesy of being able to add another row without going back to the ribbon. At this point I’d be more inclined to develop in SSMS and import to MIST.

Then my next concern is over value add / accessibility.  For example, when setting up a project there’s some basic stuff that needs to be done – setting up connections, importing from databases – that should just be a wizard when starting up  a fresh project.  When creating a dimension, a bundle of default attributes should be added (preferably from a checklist or custom template).

So my first impression is that it needs a user experience workover. However this is a far from unique criticism of many developer tools so I won’t go too  hard on them. I’ll press on with it and see how the functionality unveils itself.

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