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$xml = new DOMDocument ();
$xml->load ( $xmlFilePatht );
if (! $xml->schemaValidate ( $xmlSchema )) {
        echo basename($xmlFilePath) . " is invalid according to " . basename($xmlSchema) . " the errors are:" . PHP_EOL;
        $errors = libxml_get_errors ();
        foreach ( $errors as $error ) {
                print libxml_display_error ( $error );
        }
 

<?xml version="1.0"?>
<example>
        <child_string>This is an example.</child_string>
        <child_integer>Error condition.</child_integer>
</example>