CDX File Format Specification

CDXConstants.h is available at https://www.cambridgesoft.com/services/documentation/sdk/chemdraw/cdx/CDXConstants.h

However, it does not seem to be up to date for ChemDraw 18. I see new elements in CDXML files, for example:-

xxxx

and new attributes, for example ChemPropFormula="Chemical Formula: ".

In the equivalent CDX file there are new CDXDatumID values (enums) .

Is an updated version available?

Also I cannot find documentation of the CDXML element and attribute names equivalent to the CDXDatumID (kCDXObj_* and kCDXProp_*) values. Is this information available?

Thanks.