Return type: Switch
Returns:       If the attribute, entity or notation was declared with a public identifier, the return value is true. Otherwise, it returns false. Replacing is with isnt will reverse these results.

Syntax

(entity | notation) (is | isnt) public
OR 
attribute attribute-name (is | isnt) public

This operator is used as an entity or a notation test. With a slightly different syntax (noted above) it can be used as an attribute test as well.

Related Syntax is cdata-entity is default-entity is public is sdata-entity is subdoc-entity is system is internal is ndata-entity

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