411 REFERENCE · Wikibooks
Ada Programming/Attributes/'External Tag
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Description
An external string representation of the tagged type.
For every subtype S of a tagged type T (specific or class-wide):
S'External_Tag denotes an external string representation for S'Tag; it is of the predefined type String. External_Tag may be specified for a specific tagged type via an attribute_definition_clause; the expression of such a clause shall be static. The default external tag representation is implementation defined.
Example
S’External_Tag return String