The HL7 CDA Schema Explorer is an interactive browser for the CDA XML schema. It allows you to explore the XML tags with their cardinalities and the required and optional attributes.
Clinical Document Architecture (CDA) is an XML-based standard for sharing clinical documents, such as discharge summaries, progress notes, and consultation letters. It is based on the HL7 Version 3 Reference Information Model (RIM) and acts as a basis for the CCD (Continuity of Care Document) and C-CDA (Consolidated CDA) standards.