Mapping SELECT data types
Defines a list of data types,
 | called the 'select-list',
| whose values are valid instances of select data type,
| and include all of the subtype entities of supertypes
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An instance of a select data type shall be a value of a least one of the data types in the select-list.
| If the data type in the select list is itself a select data type, then the encoding rules are applied recursively.
| Only instances of entity data types, simple data types and enumeration data types can actually be encoded. | |
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