XMLLINT OUTPUT: xmllint --valid persons.with_duplicate_ID.xml persons.with_duplicate_ID.xml:7: element person: validity error : ID pid.1 already defined <person id="pid.1" description="OOPS, same ID as Alice"> ^
XMLLINT OUTPUT: with_duplicate_ ID.xml with_duplicate_ ID.xml: 7: element person: validity error : ID pid.1 already defined
^
xmllint --valid persons.
persons.
<person id="pid.1" description="OOPS, same ID as Alice">