nokogiri and xml preprocessing instructions

[Max Zloy]

Hello!
What is the "official" way to find out if the document I am working on has a PI instruction like this: "<?xml version=.., encoding=..?>" ?
Using "doc.xpath('//processing-instruction()')" does not provide any valuable information.

[Mike Dalessio]

Hi Max,

Thanks for asking this question. There's no "official" way, but this works (at least on MRI with libxml2) ...

Starting with the example at http://www.nokogiri.org/tutorials/modifying_an_html_xml_document.html#adding_a_processing_instruction

You can then examine `doc.root.previous`. If it's present, it should be a PI.

HTH,

-mike

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