Updating XML values with DOM

Question

Guys,
I have XML that looks like this:
<datasheet>
<row num="1">
<dept>test</dept>
<code>test</code>
<prints>test</prints>
<origs>test</origs>
<sf>test</sf>
<price>test</price>
<description>test</description>
</row>
<row num="2">
<dept>asdf</dept>
<code>adad</code>
<prints>asdf</prints>
<origs>adf</origs>
<sf>asdf</sf>
<price>asdf</price>
<description>asdf</description>
</row>
</datasheet>
I need to update this info useing DOM, can you help me out. I know how to update single fields but not when they are displayed like this.
          document.getElementsByTagName("department").item(0).getFirstChild().setNodeValue("COLOR2");
can you help?

Answer 1

So if it is NULL then we and and then if there is a record we just update like this rigth?
               NodeList nl=document.getElementsByTagName("row");
               for(int i=0; i<nl.getLength(); i++){
                    if(((Element)nl.item(i)).getElementsByTagName("dept").item(0).getFirstChild() == null){
                         ((Element)nl.item(i)).getElementsByTagName("dept").item(0).appendChild(document.createTextNode("tagtext"));
                    else {
                         ((Element)nl.item(i)).getElementsByTagName("dept").item(0).getFirstChild().setNodeValue("COLOR2");