The context is any element that has an ElementDefinition.id that matches that
found in the expression. This includes ElementDefinition Ids that have
slicing identifiers. The full path for the element is [url]#[elementid]. If
there is no #, the Element id is one defined in the base specification.
Returns the enum constant of this type with the specified name.
The string must match exactly an identifier used to declare an
enum constant in this type. (Extraneous whitespace characters are
not permitted.)
Parameters:
name - the name of the enum constant to be returned.