| Attribute | Schema Datatype or Enumeration | Usage | Definition | Business Rules |
|---|---|---|---|---|
| OID | oid | Required | Unique identifer for the MethodDef element. | The OID attribute value must be unique within the Study/MetaDataVersion. |
| Name | name | Required | Human readable name for the method. | The Name attribute must be unique within the set of MethodDef elements within a Study/MetadataVersion. |
| Type | (Computation | Imputation | Transpose | Preload) | Optional | Computation - derivation involving one or more variables. Imputation - derivation based on other observations. Transpose - conversion of rows to columns or vice versa. Preload - retrieve and populate data from an external source. | Type="Preload" is the default value when a MethodDef is referenced from an ItemGroup. |
| CommentOID | oidref | Optional | Reference to a CommentDef with information related to this MethodDef. | Must match the OID attribute of a CommentDef element within in this Study/MetaDataVersion. |
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