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 

Class Region.ITXX.Utility.COMMON.CDA2.Schema.POCDMT000040.Observation Extends (%RegisteredObject, %XML.Adaptor) [ CompileAfter = (Region.ITXX.Utility.COMMON.CDA2.Schema.ActClassObservation, Region.ITXX.Utility.COMMON.CDA2.Schema.NullFlavor, Region.ITXX.Utility.COMMON.CDA2.Schema.bl, Region.ITXX.Utility.COMMON.CDA2.Schema.xActMoodDocumentObservation), ProcedureBlock ]
{

Parameter ELEMENTQUALIFIED = 1;

Parameter NAMESPACE = "urn:hl7-org:v3";

Parameter XMLNAME = "POCD_MT000040.Observation";

Parameter XMLSEQUENCE = 1;

Parameter XMLTYPE = "POCD_MT000040.Observation";

Property value As list Of Region.ITXX.Utility.COMMON.CDA2.Schema.ANY(XMLNAME = "value", XMLPROJECTION = "ELEMENT");