A DESCRIPTION OF THE PROBLEM :
https://docs.oracle.com/javase/10/docs/api/javax/xml/validation/Validator.html#validate(javax.xml.transform.Source,javax.xml.transform.Result)
(Java 8 to 10)

>If the Result type doesn't match the Source type of if the Source is an XML artifact that the implementation cannot validate (for example, a processing instruction).

"of" in "type of if the Source" should be "or"


FREQUENCY : always