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Each domain is represented by a single dataset.

All datasets are structured as flat files with rows representing observations and columns representing variables. Each dataset is described by metadata definitions that provide information about the variables used in the dataset. 

SEND datasets are named to be consistent with the domain code (see the Study Data Technical Conformance Guide for more details on naming datasets for submission to the FDA; https://www.fda.gov/media/88173/download). For example, the Demographics (DM) dataset is named dm.xpt. See SEND controlled terminology (available at http://www.cdisc.org/terminology) for a list of standard and reserved domain codes. Exceptions to this rule are described in the following subsections for general-observation class datasets. See Section 8.2, Relating Records - RELREC, for RELREC; Section 8.3, Supplemental Qualifiers - SUPP-- Datasets, for SUPP; and Section 8.5, Relating Findings To Multiple Subjects - Subject Pooling, for POOLDEF.

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