JDOM Modify XML

I have to use the JDOM java api.  Can anyone point me to some examples or let me know how to change the following xml using JDOM?

I have to locate the correct entity (e.g., entity = 50).  If there isn't a value attribute, I have to create a value attribute set to some numeric number.  If there is a value attribute, I have to change its number.
<map>
    <data> 
        <entity id="45" value="234" />
        <entity id="50" />
    </data>
</map>

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lcorAsked:
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objectsCommented:
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CEHJCommented:
Use XPath. Something like
XPath xPath = XPath.newInstance("/map/data/entity[id='50']");
Element entity = (Element) xPath.selectSingleNode(document);

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