Return type: Switch
Returns:       Returns true in either case if the entity or notation was declared with a system identifier, and false otherwise. Replacing is with isnt will reverse the results.

Syntax

(entity | notation) (is | isnt) system

A test that can be applied to either an entity or a notation. It succeeds in either case if the entity or notation is a system identifier.

Related Syntax is cdata-entity is default-entity is external is in-library is public is sdata-entity is subdoc-entity is internal is ndata-entity

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