This page contains automated test results for code from O'Reilly's Ruby Cookbook. If this code looks interesting or useful, you might want to buy the whole book.

Validating an XML Document (written by Mauro Cicio)
CodeExpectedActual
require 'rubygems'
require 'libxml'
dtd = XML::Dtd.new(%{<!ELEMENT rubycookbook (recipe+)>
<!ELEMENT recipe (title?, problem, solution, discussion, seealso?)+>
<!ELEMENT title (#PCDATA)>
<!ELEMENT problem (#PCDATA)>
<!ELEMENT solution (#PCDATA)>
<!ELEMENT discussion (#PCDATA)>
<!ELEMENT seealso (#PCDATA)>})
open('cookbook.xml', 'w') do |f|
  f.write %{<?xml version="1.0"?>
<rubycookbook>
 <recipe>
   <title>A recipe</title>
   <problem>A difficult/common problem</problem>
   <solution>A smart solution</solution>
   <discussion>A deep solution</discussion>
   <seealso>Pointers</seealso>
 </recipe>
</rubycookbook>
}
end
document = XML::Document.file('cookbook.xml')
document.validate(dtd)
 true true 
schema = XML::Schema.from_string %{<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <xsd:element name="recipe" type="recipeType"/>
  <xsd:element name="rubycookbook" type="rubycookbookType"/>
  <xsd:element name="title"      type="xsd:string"/>
  <xsd:element name="problem"    type="xsd:string"/>
  <xsd:element name="solution"   type="xsd:string"/>
  <xsd:element name="discussion" type="xsd:string"/>
  <xsd:element name="seealso"    type="xsd:string"/>
  <xsd:complexType name="rubycookbookType">
   <xsd:sequence>
      <xsd:element ref="recipe"/>
    </xsd:sequence>
 </xsd:complexType>
  <xsd:complexType name="recipeType">
    <xsd:sequence>
      <xsd:element ref="title"/>
      <xsd:element ref="problem"/>
      <xsd:element ref="solution"/>
      <xsd:element ref="discussion"/>
      <xsd:element ref="seealso"/>
    </xsd:sequence>
  </xsd:complexType>
</xsd:schema>
}
document.validate(schema)
 true true