We have imported a CLinical Document Architecture v2 (CDA2) schema to create CDA2 content using %XML.Adaptor classes
Schema
https://gazelle.ihe.net/XSD/HL7/CDA/POCD_MT000040.xsd
One of the item is "observation " with value property
Extensible Markup Language (XML) is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable.