This is the second in a series of papers prepared for an Education Priorities Working Group being run by W3C. While the first paper, Proposed W3C Priorities for Education, took a high level overview, this paper drills down into a proposal for a specific work item. At the technical level, which is not education-specific, I call this XDMDL, eXtensible Data Model Declaration Language. At the education level, I propose that the XDMDL should be used to underpin a new digitial ecosystem for learning. It is this education-specific ecosystem for which I propose the name STARLET: Shareable Tools Activities and Resources for Learning Education and Training. As before, if you are interested in what you read and want to get involved in the W3C discussions, email me at email@example.com.