I am parsing XML and need a script that will read my XML file and add in the open tag for all missing open tags. Example from XML below: <promo_code/> has no matching open tag <promo_code> I need the code to scan and add missing open tags. End result would be <promo_code> <promo_code/> Example XML code below…

<orders>
  <order>
    <alt_number>2222</alt_number>
    <state>processed</state>
    <user_id>1234</user_id>
    <dd_id>54321</dd_id>
    <placed_at/>
    <total_price>449.0</total_price>
    <total_shipping_costs>90.0</total_shipping_costs>
    <discount>0</discount>
    <dd_status_code>HD</dd_status_code>
    <dd_status_desc>ORDER IS ON HOLD UNTIL 11/01/13</dd_status_desc>
    <promo_code/>
    <billing_address>
      <address_id/>
      <dd_customer_id/>
      <address_1>1212 Not Real</address_1>
      <address_2></address_2>
      <city>san mateo</city>
      <title></title>
      <company></company>
      <first_name>Jane</first_name>
      <last_name>Doe</last_name>
      <state_abbr/>
      <formated_telephone/>
      <zipcode/>
      <email>smith@smith.com</email>
      <country_code>USA</country_code>
    </billing_address>
    <transaction>
    </transaction>
    <shipments>
      <shipment_id>21286</shipment_id>
      <shipment>
        <shipping_address>
          <address_id>27696</address_id>
          <dd_customer_id/>
          <address_1>1212 Not Real</address_1>
          <address_2></address_2>
          <city>san jose</city>
          <title>Dr</title>
          <company></company>
          <first_name>Jane</first_name>
          <last_name>Doe</last_name>
          <state_abbr>CA</state_abbr>
          <formated_telephone>555-555-5555 Jane Smith</formated_teleph
+one>
          <zipcode>95125-3344</zipcode>
          <email></email>
          <country_code>USA</country_code>
        </shipping_address>
        <delivery_date>2011-10-01</delivery_date>
        <gift>true</gift>
        <gift_email>smith@smith.com</gift_email>
        <gift_message>Happy Birthday</gift_message>
        <status>N</status>
        <tracking_nr></tracking_nr>
        <sent_at/>
      </shipment>
    </shipments>
    <line_items>
      <line_item>
        <line_item_id>16821</line_item_id>
        <dd_id>IDID</dd_id>
        <name>Keep It Coming</name>
        <quantity>1</quantity>
        <price>359.0</price>
        <shipment_id>21286</shipment_id>
        <shipping_costs>90.0</shipping_costs>
        <tax_amount>0</tax_amount>
      </line_item>
    </line_items>
  </order>
<orders>
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