sed command for copying the contents of other file replacing it another file on specifc pattern

Shell Programming and Scripting
1

We have 2 file XML files - FILE1.XML and FILE2.xml - we need copy the contents of FILE1.XML and replace in FILE2.xml pattern "<assignedAttributeList></assignedAttributeList>"
FILE1.XML

  1. <itemList>
  2. <item type="Manufactured">
  3. <resourceCode>431048</resourceCode>
  4. <assignedAttributeList></assignedAttributeList>
  5. </item>
  6. <item type="Manufactured">
  7. <resourceCode>431079</resourceCode>
  8. <assignedAttributeList></assignedAttributeList>
  9. </item>
  10. </itemList>
    FILE2.XML
    <assignedAttributeList>
    <assignedAttribute>
    <attributeCode>Dia</attributeCode>
    <attributeValueCode>18"</attributeValueCode>
    </assignedAttribute>
    <assignedAttribute>
    <attributeCode>Base</attributeCode>
    <attributeValueCode>22V50FM1</attributeValueCode>
    </assignedAttribute>
    <assignedAttributeList>
    Final FILE1.XML should be like this
    ------------------------------------
  11. <itemList>
  12. <item type="Manufactured">
  13. <resourceCode>431048</resourceCode>
  14. <assignedAttributeList></assignedAttributeList>
  15. </item>
  16. <item type="Manufactured">
  17. <resourceCode>431079</resourceCode>
  18. <assignedAttributeList>
    <assignedAttribute>
    <attributeCode>Dia</attributeCode>
    <attributeValueCode>18"</attributeValueCode>
    </assignedAttribute>
    <assignedAttribute>
    <attributeCode>Base</attributeCode>
    <attributeValueCode>22V50FM1</attributeValueCode>
    </assignedAttribute>
    <assignedAttributeList>
  19. </item>
  20. </itemList>