Alternatives to getChildNodes()

[Ben Giddings <be...@webhelp.com>]

Hi there,

I have some XML data that looks like:

...
   <Entry>
     <Date>2001-10-20</Date>
     <Count>32</Count>
   </Entry>
   <Entry>
     <Date>2001-10-21</Date>
     <Count>78</Count>
   </Entry>
   <Entry>
     <Date>2001-10-22</Date>
     <Count>43</Count>
   </Entry>
   <Entry>
     <Date>2001-10-23</Date>
     <Count>3</Count>
   </Entry>
...

I've been trying to come up with an extension function that will sum all 
the counts over a certain date range.

My call looks something like:

<xsl:value-of select="my-ext:sumOverDays(../*, '--10-21', 1, 'Count', 
'Date')"/>

My first parameter to the function passes in a NodeList with all the 
"Entry" nodes in it.  Each "Entry" node should have 2 child nodes, 
"Date" and "Count".  The problem is that if I say:

node_list.item(i).getChildNodes();

I get a "Not Supported Exception" because the implementation of the Node 
is a DTMNodeProxy and the method is defined as:

public final NodeList getChildNodes()
{
   throw new DTMDOMException(DOMException.NOT_SUPPORTED_ERR);
}



So, my question is, how do I get a sum over a range of dates like this? 
  Because my range of values is a range of dates, I can't come up with 
an XPath statement that returns that set of nodes and passes it to the 
extension function.

Can anyone enlighten me?

Ben