This paper discusses the Learning Resource Metadata Initiative (LRMI), an international project that aims to facilitate the discovery of educational resources through the use of embedded metadata that can be used by search engines (e.g. Google, Yahoo, Bing, Yandex) to refine the search services they offer. LRMI has extended the schema.org metadata vocabulary with terms that are specifically relevant to aiding the discovery of learning resources. In order to understand LRMI metadata it is necessary to first introduce schema.org metadata. LRMI was later funded to assist a number of services providing open educational resources in modifying their display interfaces so that they included relevant embedded metadata. In addition to synthesizing the lessons learned from these implementations, the current phase of the LRMI project is engaging with potential users, including search providers and learning resource developers, with the aim of extending the uptake and implementation of the specification.