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 For element 'X' : For attribute 'Y' = entity "Z", public
id is 'A'.
     where Z is the name of the external entity.
     or
 For external entity 'X': public id is 'Y'.
An external entity has a specified public identifier which was not
defined by a library declaration in the OmniMark program.
Copyright © Stilo International plc, 1988-2010.