Re: [ddlm-group] Multi block principles
- To: "Bollinger, John C" <John.Bollinger@stjude.org>
- Subject: Re: [ddlm-group] Multi block principles
- From: James H <jamesrhester@gmail.com>
- Date: Wed, 1 Dec 2021 17:05:04 +1100
- Cc: Group finalising DDLm and associated dictionaries <ddlm-group@iucr.org>
- In-Reply-To: <CAM+dB2fiPmiCXJ8JSca8Uc3XvcNeSHJ-MkaKjN9OP1AVLTW-hQ@mail.gmail.com>
- References: <CAM+dB2fajH1c1vhrCJU9v-QQw0kt4Y2udDEx4HBK9QzDq=LD3w@mail.gmail.com><CH2PR04MB6950E54AF550C819FF598F35E0999@CH2PR04MB6950.namprd04.prod.outlook.com><CAM+dB2frS4Xg7fhxy5GQcw5t0WJ+pvia-HvqwLAzC-ySZoU+QQ@mail.gmail.com><CH2PR04MB695069448B0B396DE843ECEAE09C9@CH2PR04MB6950.namprd04.prod.outlook.com><CAM+dB2e-hSg5m4C7+MUbEWhK1ni2GOWWEWoGJCwS5_Xkq6uzuA@mail.gmail.com><CH2PR04MB6950FD4238F32E64416CAC4EE09F9@CH2PR04MB6950.namprd04.prod.outlook.com><CAM+dB2co6kOup_P9ZawKontOM+yE_CfFPh2NuVU0S6fvtT_T3w@mail.gmail.com><CH2PR04MB69507BF8620D6DC960DECEB6E0609@CH2PR04MB6950.namprd04.prod.outlook.com><CAM+dB2fiPmiCXJ8JSca8Uc3XvcNeSHJ-MkaKjN9OP1AVLTW-hQ@mail.gmail.com>
(i) Multiple data blocks are aggregated into a data set by being presented in the same data container (e.g. file, zip archive, directory).
(ii) The following backwards-compatible assumption is made for DDLm: A "Set" category is a "Loop" category for which only one row may be presented in a data block
(iii) The set of "Set" categories for a data block is determined by _audit.schema
(iv) A "Set" category may only be aggregated from multiple data blocks if a key data name for the "Set" category has been provided in the dictionary to which those data blocks conform.
(v) Where a "Set" category has been provided with a key data name in the dictionary as per (iv), all child data names must also be provided in the dictionary.
(vi) The value of a "Set" category key data name for a given data block may be explicitly stated or, if missing, an arbitrary, unique value is assigned.
(vii) Values for child data names of "Set" category key data names may always be elided.
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