루비에서 XML을 사용하는 구체적인 방법

== USAGE


Basic usage for reading and writing documents.


=== WRITING


Writing a simple document:


  # require ‘rubygems’ # if installed via Gems
require ‘xml/libxml’

doc = XML::Document.new()
doc.root = XML::Node.new(‘root_node’)
root = doc.root

root << elem1 = XML::Node.new(‘elem1’)
elem1[‘attr1’] = ‘val1’
elem1[‘attr2’] = ‘val2’

root << elem2 = XML::Node.new(‘elem2’)
elem2[‘attr1’] = ‘val1’
elem2[‘attr2’] = ‘val2’

root << elem3 = XML::Node.new(‘elem3’)
elem3 << elem4 = XML::Node.new(‘elem4’)
elem3 << elem5 = XML::Node.new(‘elem5’)

elem5 << elem6 = XML::Node.new(‘elem6’)
elem6 << ‘Content for element 6’

elem3[‘attr’] = ‘baz’

# Namespace hack to reduce the numer of times XML:: is typed
include XML
root << elem7 = Node.new(‘foo’)
1.upto(10) do |i|
  elem7 << n = Node.new(‘bar’)
  n << i
end

format = true
doc.save(‘output.xml’, format)


The file output.xml contains:


<?xml version=”1.0″?>
<root_node>
  <elem1 attr1=”val1″ attr2=”val2″/>
  <elem2 attr1=”val1″ attr2=”val2″/>
  <elem3 attr=”baz”>
    <elem4/>
    <elem5>
      <elem6>Content for element 6</elem6>
    </elem5>
  </elem3>
  <foo>
    <bar>1</bar>
    <bar>2</bar>
    <bar>3</bar>
    <bar>4</bar>
    <bar>5</bar>
    <bar>6</bar>
    <bar>7</bar>
    <bar>8</bar>
    <bar>9</bar>
    <bar>10</bar>
  </foo>
</root_node>


=== READING


Reading XML is slightly more complex and there are many more ways to
perform this operation.  This reads in and processes the above
generated XML document, output.xml. This script assumes that the
structure of the document is already known.


  # require ‘rubygems’ # if installed via Gems
require ‘xml/libxml’
doc = XML::Document.file(‘output.xml’)
root = doc.root

puts “Root element name: #{root.name}”

elem3 = root.find(‘elem3’).to_a.first
puts “Elem3: #{elem3[‘attr’]}”

doc.find(‘//root_node/foo/bar’).each do |node|
  puts “Node path: #{node.path} \t Contents: #{node.content}”
end


And your terminal should look like:


Root element name: root_node
Elem3: baz
Node path: /root_node/foo/bar[1]         Contents: 1
Node path: /root_node/foo/bar[2]         Contents: 2
Node path: /root_node/foo/bar[3]         Contents: 3
Node path: /root_node/foo/bar[4]         Contents: 4
Node path: /root_node/foo/bar[5]         Contents: 5
Node path: /root_node/foo/bar[6]         Contents: 6
Node path: /root_node/foo/bar[7]         Contents: 7
Node path: /root_node/foo/bar[8]         Contents: 8
Node path: /root_node/foo/bar[9]         Contents: 9
Node path: /root_node/foo/bar[10]        Contents: 10


== MORE INFORMATION


If you have any questions, please send email to libxml-devel@rubyforge.org.

출처 : * http://libxml.rubyforge.org/doc

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