diff --git a/lib/oga.rb b/lib/oga.rb
index 2a433c3..657670f 100644
--- a/lib/oga.rb
+++ b/lib/oga.rb
@@ -4,5 +4,8 @@ require_relative 'oga/ast/node'
 
 require_relative 'oga/xml/lexer'
 require_relative 'oga/xml/parser'
+require_relative 'oga/xml/node'
+require_relative 'oga/xml/element'
+require_relative 'oga/xml/builder'
 
 require_relative 'oga/html/parser'
diff --git a/lib/oga/xml/builder.rb b/lib/oga/xml/builder.rb
new file mode 100644
index 0000000..f497196
--- /dev/null
+++ b/lib/oga/xml/builder.rb
@@ -0,0 +1,28 @@
+module Oga
+  module XML
+    ##
+    # Class for building a DOM tree of XML/HTML nodes.
+    #
+    # @!attribute [r] ast
+    #  @return [Oga::AST::Node]
+    #
+    class Builder < ::AST::Processor
+      attr_reader :ast
+
+      ##
+      # @param [Oga::AST::Node] ast
+      #
+      def initialize(ast)
+        @ast = ast
+      end
+
+      def on_element(node)
+
+      end
+
+      def on_text(node)
+
+      end
+    end # Builder
+  end # XML
+end # Oga
diff --git a/lib/oga/xml/element.rb b/lib/oga/xml/element.rb
new file mode 100644
index 0000000..bb55eb5
--- /dev/null
+++ b/lib/oga/xml/element.rb
@@ -0,0 +1,19 @@
+module Oga
+  module XML
+    ##
+    # Class that contains information about an XML element such as the name,
+    # attributes and child nodes.
+    #
+    class Element < Node
+      ##
+      # @param [String] name The name of the element
+      # @see Oga::XML::Node#initialize
+      #
+      def initialize(name, options = {})
+        super(options)
+
+        @name = name
+      end
+    end # Element
+  end # XML
+end # Oga
diff --git a/lib/oga/xml/node.rb b/lib/oga/xml/node.rb
new file mode 100644
index 0000000..8c087cf
--- /dev/null
+++ b/lib/oga/xml/node.rb
@@ -0,0 +1,36 @@
+module Oga
+  module XML
+    ##
+    # @!attribute [r] parent
+    #  @return [Oga::XML::Node]
+    #
+    # @!attribute [r] children
+    #  @return [Array<Oga::XML::Node>]
+    #
+    # @!attribute [r] next
+    #  @return [Oga::XML::NOde]
+    #
+    # @!attribute [r] previous
+    #  @return [Oga::XML::Node]
+    #
+    class Node
+      attr_reader :parent, :children, :next, :previous
+
+      ##
+      # @param [Hash] options
+      #
+      # @option options [Array] :children The child nodes of the current
+      #  element.
+      #
+      # @option options [Oga::XML::Node] :parent The parent node.
+      # @option options [Oga::XML::Node] :next The following node.
+      # @option options [Oga::XML::Node] :previous The previous node.
+      #
+      def initialize(options = {})
+        options.each do |key, value|
+          instance_variable_set("@#{key}", value) if respond_to?(key)
+        end
+      end
+    end # Element
+  end # XML
+end # Oga