Private Market Networks (PMNs), as discussed in the Strategy & Business article The New Financial Matchmakers, look like a perfect use case for the use of an XBRL taxonomy as a foundation for the data provided to an exchange by buyers and sellers. Check the author’s conclusion:

If government officials around the world allow this new global network to multiply the natural power of capitalism, if the requisite levels of transparency and trustworthiness are fostered in the design of these systems, and if business leaders and investors recognize the value of more direct interaction, then the new networks for allocating capital will rapidly take their place alongside more established exchanges — and could even begin to displace them.

Using an open XBRL taxonomy would provide the ‘requisite level of transparency’ these exchanges need at a stroke. And power new and more open kinds of trading analytics. Yet XBRL is not even mentioned in the article. Bizarre.