Parsing an invalid XML element

[bendrissou]

Description

The parser accepts and parses a XML element that is syntactically invalid, without raising an error. This is despite enabling the validator option "-v".

Input

<?xml version="1.0" ?>  <a/> <! <!---->  	

In the above example, token <! is duplicated, which I expected to raise an error. The input is saved in a file named example.xml.

Code

./src/cli/cli.js -v example.xml

Output

{ '?xml': { '@_version': 1 }, a: '', '!': '' }

My question is: Why the XML validator doesn't throw an error in this case?
Please note that xmllint rejects the input example as invalid.