operator
public-identifier of entity
public-identifier of entity retrieves the public identifier of the currently-active external entity,
if any. It can be used in an external-data-entity rule or a external-text-entity rule, or in the
dynamic scope created by the execution of these rules. So, in a function called from the body of an
external-text-entity rule, public-identifier of entity will evaluate to the public identifier of
the entity that fired the rule. If the currently-active entity is a defaulted entity,
public-identifier of entity will evaluate to the public identifier of the default entity as it was
declared in the input DTD.
In an external-data-entity rule or an external-text-entity rule, the format item %pq
is a shorthand for public-identifier of entity.
It is an error to invoke public-identifier of entity for an entity that
was not declared with a public identifier. When in doubt, public-identifier of entity should be
preceded by the entity is public test:
do when entity is public output public-identifier of entity