Missing schema generates too many warnings

[fbricon]

Create a document, referencing an unreachable schema, then each node of that document will get a warning about it:

Try with:

<?xml version="1.0" encoding="UTF-8"?>
<invoice xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:noNamespaceSchemaLocation="invoice.xsd">
  <date>2017-11-30</date>
  <number>5235</number>
  <products>
    <product />
  </products>
  <payments>
    <payment amount="770.00" method="credit"/>
  </payments>
</invoice>

Moreover, the warning range is incorrect, it selects the closing bracket.

[fbricon]

mmm I see that IDEA generates the same warnings (with proper ranges though). So fixing that range should definitely be the 1st step. We can discuss about fixing the amount of diagnostics