Optional_Optional_Label for section (e.g. for ToC)
OptionalauthorWho and/or what authored the section
OptionalemptyWhy the section is empty
OptionalentryExtensible classifiers as content
OptionalentryQuantity as content
OptionalentryReference to resources as content
OptionalextensionAdditional content defined by implementations
OptionalfocusClassification of section (recommended)
OptionalfocusClassification of section by Resource
OptionalidUnique id for inter-element referencing
Optionalmodeworking | snapshot | changes
OptionalmodifierExtensions that cannot be ignored even if unrecognized
OptionalorderedOrder of section entries
OptionalsectionNested Section
OptionaltextText summary of the section, for human interpretation
OptionaltitleLabel for section (e.g. for ToC)
working | snapshot | changes