Currently the dADL syntax in ADL does not support partial date/time values which are allowed by ISO8601, and are needed for assumed and default values in ADL for partial date/time pattern constraints in cADL, such as YYYY-MM-??.
Add partial date/time types to dADL. Use a form which deviates from ISO8601, but which is
safer to parse. Where ISO would allow "12" meaning "12 pm", this proposal uses "12:??:??".