The FieldAliasSchema datatype includes various settings.

Table: FieldAliasSchema

idstringyes The unique identifier of the field alias schema.
namestringyes The name of the schema.
fields[SchemaField]yes The schema fields. This uses a datatype called, SchemaField, which has two string fields: named, which is required; and description.
instances[AliasMapping]yes The instances used. See the AliasMapping table.
versionstringyes The version.

[a] Some arguments may be required, as indicated in this column. For some fields, this column indicates that a result will always be returned for it.