Kristen, correct, you cannot make the border translucent - in other words, the border of the card can't contain an alpha value. However, the background of the card can be set to transparent, or a translucent tint. You can also add an opaque border around the image of a card in various widths and colors, but not levels of transparencies - on that note, you also cannot adjust the transparency level of the card image, it's either on or off.
Of course you can do all of your design in InDesign: Add borders, text, design the shape of your card rectangles (as long as they can conform to the grid of your browse page). However, that defeats the purpose of why and how this meta-tagging, card assigning system was intended to work. Based on the criteria of any given article (and proper tagging within the article properties), the system should be able to auto assign the right size card w/ the right style (borders, text placement, visible meta data, etc) and can continue to build onto your browse page as you add and delete content, updating your app dynamically.
Does that make sense?
How are meta-tags useful in this context? If you have two types of content browsing features, 1. Being a storefront (with or without cards) 2. Being the app menu system, and there is no search feature available, how are these meta tags useful?
Well, In THIS context, I was just speaking of how the meta-tagging can assign the type and style of card treatment that is applied to an item on a browse page: Article, Banner or Collection. However, it is my understanding that in the grand scheme of the new DPS, meta-tagging is going to contribute to some very powerful features, such as searchable content, accessibility, recommendations for similar articles, and even custom user-generated collections and "smart" collections.
I guess I'm a bit confused Kristen If you want a border that doesn't show why do you have a border? Just set the border widths to 0. Or are you trying to push the content of the card in from the edges? If that's what you're trying to do then use the margins settings on the Layout tab for the image and text area.