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Related Syntax | ||
operator |
is external |
Return type: Switch
Returns: Returns true if the object or entity is external, and false otherwise. Replacing is
with isnt
reverses the results.
Syntax
stream-name indexer? (is | isnt) external OR (for entity test) entity (is | isnt) external
This keyword tests to determine whether the object attached to a stream is external (an externally defined output stream). It returns true if the object is external, and false otherwise. Replacing is
with isnt
will reverse the results.
It can also be used as an entity test that returns true if the entity is an external entity. In this form, it is used primarily when testing the entities named by the values of entity
or entities
attributes. This test will always be true in an external-text-entity
or external-data-entity
rule.
Related Syntax |
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