No PUBLIC identifier declared for external entity.

#6030 Run-time catchable error

No PUBLIC identifier declared for external entity.

Additional Information

For element 'X' : For element attribute 'Y' = entity "Z":
    where Z is the name of the attribute's external entity.
    or
For external entity 'X'.
    where X is the name of the external entity.

Explanation

The external entity does not have a specified public identifier.