Briefly:

Concordion supports table reading, via TableSupport class. However, it would be nice if this could be used more widely, for example, when I call concordion:set="#fixtureData", if I am passing in a table, this gets converted into a string, which is not what I want. Ideally, tables should be kept as-is so that I can process them inside functions.

More detailed discussion, with examples:

https://groups.google.com/forum/#!topic/concordion/B2TrOchuefU