This document discusses developing an ontology for the Data Documentation Initiative (DDI) metadata standard as linked data. It outlines the goals of creating a DDI ontology such as increasing visibility of data holdings, linking to other linked data, and enabling discovery of microdata across multiple studies. The ontology was developed by selecting a subset of important DDI elements, formulating common use cases, and mapping existing DDI-XML documents to DDI-RDF. An example discovery use case involves finding studies, questions, concepts, and variables that match specific criteria like time period, country, and subject. The presentation concludes by thanking the audience.