Colectica Reader is a free tool to view DDI 3 metadata. View DDI 3 Metadata: Colectica Reader runs on Windows.Use Colectica Reader to view your DDI 3 metadata from Colectica Designer, Colectica Express, or other DDI applications. Colectica Reader performs multiple levels of validation on your DDI 3 metadata. Ensure your metadata validates against the DDI 3 XML schema and all references are valid. Friendly XML Viewer: Colectica Reader displays your XML with helpful syntax highlighting and hierarchical folding, making it easier to find what you are looking for. Don't have DDI? No problem.