Validating XML with Schema in Ruby

I posted a long time back about my troubles in finding a way of performing schema validation in ruby (see Ruby and Xml Schema). At that time I was using REXML and only able to perform well-formedness checks based on basic structural integrity, but had no way to take an XSD and validate an instance document.

I’m pleased to say that there is a way to do this now, namely libxml-ruby. It’s available as a gem (gem install libxml-ruby) and the process is pretty simple:

  document = LibXML::XML::Document.file(@xml_filename)
  schema = LibXML::XML::Schema.new(@xsd_filename)
  result = document.validate_schema(schema) do |message,flag|
    log.debug(message)
    puts message
  end

I’ve found this to be a very neat piece of code for dealing with the kind of schema integrity checking I’m looking for, and as I blend this with a number of other java-based parses using the Ruby Java Bridge I get a pretty good, consistent perspective on validity.

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