The lossless form. Each node carries derivations when any of its
properties is a derived value (see ExportNode). The document stays
at version 1: the field is optional and additive, and the toolkit has
no reader of this document, so a consumer that ignores unknown keys
reads it exactly as before.
The lossless form. Each node carries
derivationswhen any of its properties is a derived value (seeExportNode). The document stays at version 1: the field is optional and additive, and the toolkit has no reader of this document, so a consumer that ignores unknown keys reads it exactly as before.