AppendInto appends extensions into the specified Resource or Element.

Clear removes all extensions from the specified FHIR Element or Resource.

FromElement creates an extension from the specified datatype resource.

New creates an New extension object from a concrete, and legal, extension type.

Overwrite modifies a Resource or Element in-place to overwrite all of the extensions in the given object with the provided ones.

SetByURL always remove all extensions with url, and creates N extensions with url and values...

Unwrap will return the wrapped Element in this extension, if one exists.

Upsert always replaces or inserts the extension by the URL.

ErrInvalidValueX is an error reported if trying to create an Extension from an invalid data-type.

ValueX is a constraint that enumerates all the valid 'DataType' objects that can be used for extensions.