A large number of universities and other institutions in The Netherlands cooperated in a large project called NKBW. One of the goals was to set up a portal for basic skills in mathematics, which includes a repository with learning materials for basic mathematics, especially for materials around the transition from secondary school to university level.
As a spin-off, a special interest group discussed about the question what metadata and which exchange formats to use for sharing mathematical test and exercise materials. Some of the results and experiences are presented in this talk.