IEEE-like spec on CDBA and OA

Hello, In lots of places and legacy projects I saw “prop.xx”, which libManager describes as preceding data.dm. The prop.xx is defined in CDBA Data.dm is defined in open access Both seem to refer to “property bag” info It was difficult to find good formal specification for CDBA and OA (like IEEE specifications which are like “one-stop” gold standard). Could Cadence post some links here? Also, could you explain what exactly is “property bag”? G