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 public    is sdata-entity    is subdoc-entity    is internal    is ndata-entity

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