Add test to assert that a urn passes the syntax-check for xs:Name

Author: tvdijen

tests/XMLSchema/Type/NameValueTest.php

@@ -48,6 +48,7 @@ public static function provideValidName(): array
         return [
             'whitespace collapse' => [true, "foobar\n"],
             'normalization' => [true, ' foobar '],
+            'urn' => [true, 'urn:oid:2.5.4.4'],
         ];
     }