Line number of RelaxNG error seems capped at 65535

[mikevm]

When validating an XML document using RelaxNG, the line number of the error is capped at 65535.

test code: https://gist.github.com/mikevm/71095581645c62a971194b3142d09b92

output:

$ ruby -v
ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-darwin14]
$ ruby ./test.rb
Nokogiri: 1.6.8
XML document with a schema violation on line 400
 0. RelaxNG reports error on line 400: Error validating datatype string
 1. RelaxNG reports error on line 400: Element item failed to validate content
XML document with a schema violation on line 40000
 0. RelaxNG reports error on line 40000: Error validating datatype string
 1. RelaxNG reports error on line 40000: Element item failed to validate content
XML document with a schema violation on line 70000
 0. RelaxNG reports error on line 65535: Error validating datatype string
 1. RelaxNG reports error on line 65535: Element item failed to validate content

expected the result of #line always returns the line on which the error occurred
actual the result of #line is capped at 65535.

[larskanis]

In fact this is a shortcoming in libxml2. We can not fix it in nokogiri and it probably will not be fixed in libxml2. See: https://mail.gnome.org/archives/xml/2012-August/msg00168.html

[flavorjones]

This will be fixed in v1.13.