This example documents a two-day introductory workshop on Encoded Archival Description (EAD), showing the training schedule, linked reference materials, and a hands-on XML markup exercise using a postcard from the Library of Congress. It demonstrates the use of XML schema validation, including a Relax NG compact schema (`postcard.rnc`) and a sample EAD template with namespace declarations. The code highlights specific APIs and standards, such as the `xsd:date` datatype, `xml-model` processing instruction, and the EAD XML schema (`ead.xsd`). The data originates from the workshop’s GitHub gist, featuring raw text files and images.