Generate dependent CSL style

generate_dependent_style.rb

require 'csl' # gem install csl --pre

style = CSL::Style.new do |s|
  
  s['class'] = 'in-text'
  s['default-locale'] = 'en-US'

  s.title = 'Natura'
  s.id = 'http://www.zotero.org/styles/natura.csl'

  # add default self link to id
  s.self_link!
  
  s.independent_parent_link = 'http://www.zotero.org/styles/foobar.csl'
  s.documentation_link = 'http://natura.com'

  s.info.issn = '7283-0918'

  s.info.citation_format = 'numeric'

  s.info.category = { field: 'biology'}
  s.info.category = { field: 'physics'}
end

# style.dependent? #-> true
# style.independent_parent #-> would load and parse the parent style

# style.valid? #-> would make sure the style is valid

# add the default CC license
style.default_license!

# tag the updated field with the current time
style.info.update!

# puts style.to_xml #-> would output the style as xml
puts style.to_s #-> pretty prints the style as xml

output.xml

<?xml version="1.0" encoding="utf-8"?>
<style xmlns="http://purl.org/net/xbiblio/csl" version="1.0" class="in-text" default-locale="en-US">
  <info>
    <title>Natura</title>
    <id>http://www.zotero.org/styles/natura.csl</id>
    <issn>7283-0918</issn>
    <link href="http://www.zotero.org/styles/natura.csl" rel="self"/>
    <link href="http://www.zotero.org/styles/foobar.csl" rel="independent-parent"/>
    <link href="http://natura.com" rel="documentation"/>
    <category citation-format="numeric"/>
    <category field="biology"/>
    <category field="physics"/>
    <updated>2013-03-28 18:33:35 +0100</updated>
    <rights license="http://creativecommons.org/licenses/by-sa/3.0/">This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 License</rights>
  </info>
</style>

This should include the xmlns in the style node – that's most likely a bug in the gem version, will be fixed upstream. : )