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diff --git a/lib/axlsx/rels/relationship.rb b/lib/axlsx/rels/relationship.rb
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+module Axlsx
+  # A relationship defines a reference between package parts.
+  # @note Packages automatcially manage relationships.
+  class Relationship
+
+    # The location of the relationship target
+    # @return [String]
+    attr_accessor :Target
+
+    # The type of relationship
+    # @note Supported types are defined as constants in Axlsx:
+    # @see XML_NS_R
+    # @see TABLE_R
+    # @see WORKBOOK_R
+    # @see WORKSHEET_R
+    # @see APP_R
+    # @see RELS_R
+    # @see CORE_R
+    # @see STYLES_R
+    # @see CHART_R
+    # @see DRAWING_R
+    # @return [String]
+    attr_accessor :Type
+    def initialize(type, target)
+      self.Target=target
+      self.Type=type
+    end
+
+    def Target=(v) Axlsx::validate_string v; @Target = v end
+    def Type=(v) Axlsx::validate_relationship_type v; @Type = v end
+
+    # Serializes the relationship
+    # TODO: use object.rId to get this infomation
+    # @param [Nokogiri::XML::Builder] xml The document builder instance this objects xml will be added to.
+    # @param [String] rId the reference id of the object.
+    # @return [String]
+    def to_xml(xml, rId)
+      h = self.instance_values
+      h[:Id] = rId
+      xml.Relationship(h)
+    end
+  end
+end