Behavior of gel:parse on a file differs in 15.4

Document ID : KB000097620
Last Modified Date : 22/05/2018
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Issue:
A GEL script that parses XML files using the gel:parse tag in our Production environment 15.1 throws an error when tested in our environment post 15.4 upgrade, with the following message:  
DOCTYPE is disallowed when the feature "http://apache.org/xml/features/disallow-doctype-decl" set to true.
Cause:
DE38058 - XXE Attack in XOG
Resolution:
It was identified as a security vulnerability and GEL script will need to be modified to not use DOCTYPE tag.
There’s no work around.